I would definately not do business with an unknown party that sends you unsolicited commercial e-mail (aka SPAM). What they're doing is essentially illegal, and that's not a good basis for a business relationship.
I would also be very wary of the entire "printer cartridge industry" -- it is a shady area filled with scammers.
If you go to google and type "HP 800 printer cartridge" in, and then tell it to search, then look on the right side of the page -- there will be a bunch of sponsored links for places advertising printer cartridges.
I do not know which if any are good, but if you go to a web site and it looks fairly professional, has a physical address and phone numbers visible, and has logos linking to online business rating services, etc. Then they are probably not going to rip you off.
I didn't look too much, but it looked like to me that a black printer cartridge for the HP 800 is basically less than $20 at a few places I looked.
Hope this helps.
[This message has been edited by MilesCity.com Webmaster (edited 12/11/2002).]