Rob,
I just printed a couple of pages, and the new cartridges work great.
Also there is a warning , as to not run the cartridges completely empty, it can cause damage to the printer.
Also they mention something about a cleaning cycle for the cartridge, if you start to have problems with printing.
Time to check the owners manual on that !
Prices were $13.99US for the black cartridge, and $16.99US for the color cartridge.
The printer I have is a Hewlet-Packard Deskjet 3845, not a top grade model, it came as part of a computer set from Fry's Electronics, back in October, 2004.
I don't know why I keep forgetting to post a link to these sites !!!