5 things to know about........print cartridges?

Hi guys, just here to advertise. I bought this black print cartridge meant for HP Deskjet 3910, 3930, 3940 and PSC 1410. It is the kind that's compatible with the HP printers, but not manufactured by HP. The brand is Orink. But pity, it didn't work for my PSC 1402. So now I'm trying to sell it at a dirt-cheap price of 15 bucks (I bought it at the Arts Forum bazaar, 2 for $38). Anyone who has the above-listed printers and don't mind giving it a shot, you can contact me. If the cartridge doesnt work for you either, I'll take it back and return you your moolah.
Please help! Thanks.