Retail Price: $65.99
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Compatible with HP DeskJet 940 printer
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About HP 78 Ink Cartridge

HP DeskJet 940

Buy from the cheapest place to buy printer ink online for your HP DeskJet 940 printer at CompAndSave! Our replacement for tri-color HP 78 ink cartridge that works for your HP DeskJet 940 printer will cost you a fraction of what you pay for original HP cartridges.

CompAndSave offers affordable replacement HP 78 ink cartridges that boast genuine-like quality and satisfaction. This cartridge perfectly works as the original HP 78 color ink cartridge (C6578AN/C6578DN) without fail!

  • MADE WITH PRECISION. Every ink cartridge we sell is proven and tested to work like OEM cartridges, with a tested shelf-life of at least 20 months. Our HP 78 tricolor ink cartridge is professionally engineered to ensure that CompAndSave's cartridges will function like original ones—from installation to print quality.
  • LOW PRICE, SAME QUALITY. The print capacity and quality of CompAndSave's cartridges match the original HP printer cartridges, but at a lesser price without sacrificing the quality. Purchasing an HP C6578DN from us means you get to save $47.04 (71% off retail price), talk about getting the most of your money!
  • BUMP UP YOUR SAVINGS. Want to enjoy even bigger savings? Purchase our HP 78 ink cartridges, black HP 45 ink cartridge, and black HP 15 ink cartridge in bulk.
  • NEXT DAY SHIPPING. HP 78 color ink cartridge orders placed before 2:00 p.m. PST will be shipped out the same business day. Visit our Shipping Policy for more information.
  • FREE SHIPPING. For U.S. orders, checking out $50 or more means the shipping fee is on us!
  • SATISFACTION GUARANTEE. We offer a FULL refund within ten days based on the delivery date of your CompAndSave products. We even issue refunds and store credits up to 365 days from purchase. That is how confident we are in the quality of our replacement HP 78 cartridges. Make sure to read our Return Policy for more details.
  • ECO-FRIENDLY SOLUTIONS. Did you know that our replacement or remanufactured cartridges are environmentally friendly? Instead of throwing away empty original HP cartridges, our manufacturer meticulously recycles them to function exactly like the originals. By purchasing our replacement HP 78 ink cartridges, you will not only save a ton of money, but you will also be helping to preserve the environment.
  • WILL NOT VOID PRINTER WARRANTY. Using replacement, compatible, or remanufactured printer cartridges will never void your printer warranty. To know more, check our Ink Knowledge Base page or contact us for other concerns.

Go ahead and find your printer from the compatible printer list for HP 78 ink cartridges provided below. Take advantage of our great prices for HP 78 color ink cartridges today. SAVE more now!

HP 78 Ink Cartridge FAQs

Will generic ink cartridges work in HP printers?

They sure do! CompAndSave's generic, compatible, replacement, or remanufactured ink cartridges are designed to meet or exceed the OEM specifications. This means that you can get the same print quality and the number of prints without paying as much compared to original HP ink cartridges. Aside from this, using generic ink cartridges will never void the printer's warranty. So you can shop and use our cartridges without any worry. For more information about our cartridges, click ink knowledge base, and you will be redirected to the right page.

Why is HP ink so expensive?

OEM ink and toner manufacturers claim that the high cost of toner cartridges is due to the research and development of technologies to deliver high-quality ink and toner. However, it is worth noting that there are generic cartridges that exceed OEM requirements while being less expensive than their counterparts. CompAndSave's compatible and replacement ink and toner cartridges are engineered to meet or exceed OEM standards. That is to say; you can have the same print quality and page output without spending a fortune. Please keep in mind that using generic, remanufactured, or replacement cartridges will never void the warranty on your printer. For additional information, please visit ink knowledge base, and you will be redirected to the right page.

How do I trick my HP printer to accept refilled cartridges?

By default, your HP printer should accept refilled, remanufactured or compatible cartridges right away without doing any configuration. But in case your printer doesn't accept them, make sure that the ink cartridge you are installing is the right model for your printer. Next is to wipe the copper contacts or the chip of the ink cartridge with a non-abrasive towel or cloth. Damp it with water or alcohol, then wipe the cartridge contacts and reinstall them back to your printer after 15 minutes. For more information, click Troubleshooting Tips, and you will be redirected to the right page.

How to install HP 78 ink cartridge?

The installation procedure for HP 78 ink cartridges varies on the printer model that you have. Some printers will require a different or special procedure that other models will not require. So, with that being said, we recommend looking for your printer model below in the compatible printers field. Click the printer model, and you will be redirected to another page with the correct installation procedure for your printer. For more information, you may also click Ink Installation Guide, and you will be redirected to the right page.


All ink & toner come with a one-year 100% satisfaction guarantee.
Our products will never void your printer's warranty.

HP 78 Ink Cartridge Specifications

SKU INK-HP-C6578AN
Product Type INK
Replaces OEM # C6578AN
Color Tri-color
Product Capacity Standard
Ink Volume 19 ml
Approximate Page Yield 560
Cost per page 4.46 cents
Number of pieces 1
Product Shelf Life 18-24 months

HP 78 Ink Cartridge Compatible Printers

Replacement HP 78 Ink Cartridge Reviews

44 Customer Reviews
4.8 out of 5 stars
82% Recommend
this product
5 stars 36
4 stars 5
3 stars 2
2 stars 0
1 star 1
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Replacement HP 78 Ink Cartridge - C6578DN/C6578AN - Tri-color
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  • Apr 24, 2024
    Just as good as the expensive and famous name brands but at a discounted price and quick delivery time frame!
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  • Feb 6, 2024
    Verified Buyer
    all good
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  • Jan 7, 2024
    Verified Buyer
    color cartrage works fine
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  • Oct 25, 2023
    Verified Buyer
    Fairly good color not too hot
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  • Great
    Mar 27, 2023
    Verified Buyer
    It works and that's all that matters. Had to use both new black and color in my case.
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  • Great product! Will buy again.!
    Mar 12, 2023
    Verified Buyer
    I reordered this product because it demonstrated the same quality results as the name brand. Along with very competative pricing Very satisfied !
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  • Feb 7, 2023
    Verified Buyer
    the price you can't beat it
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  • Jan 27, 2023
    Verified Buyer
    so glad I found you. Needed the ink and couldn't find it any where.
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  • Great product! Will buy again.!
    Jan 21, 2023
    Verified Buyer
    Very good product at a reasonable price! My Printer is very old but still working great. Nice to be able to still get ink cartridges for it. Can't get them thru HP any more.
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  • Great price
    Dec 29, 2022
    Verified Buyer
    Great replacement cartridge for an old printer
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