The following report compares gadgets using the SERCount Rating (base on the result count from the search engine). Note: due to some search engine quota, not all result is available yet.
Amazon Imaging Compatible Black Ink Cartridge for HP 45 (51645A)
Black ink replacement cartridge for HP 51645A, M5658G/A
Less expensive than OEM cartridge
Reliable
Long life
Fits a variety of HP printers
Rating: 1/5 from 3 reviews
Not HP Product
Rating: 1/5
I ordered as it came up as an HP product. Beware-it is a refilled cartridge, and Amazon will charge you for returning it.
Not original, and refilled too
Rating: 1/5
I agree with the other reviewer -- this is NOT an HP Inkjet cartridge. It doesn't look like the picture, and it says it's a "refilled" unit. If I wanted a refilled one, I could have gotten it a lot cheaper elsewhere. The only good thing I can say is it came with a prepaid envelope for recycling the old cartridge (which they will presumably refill and sell to somebody else!)
Don't Be Fooled
Rating: 1/5
This is not an original HP Printer cartridge. It is a knockoff instead. Don't be fooled and think that you are getting an original HP manufactured cartridge. You are not. Order from HP's site and at least you will get the product you want.