I just recently picked up a large batch of ink cartridges as part of a computer store's liquidation sale. I took the carts for the printer I have, but there were some others for which I don't have a printer.

$5 each:
Epson 88 Magenta x15
Canon BCI-24 Black x5
HP 29 Black x1

$10 each:
Epson T042520 Color x2
Epson T009201 Color x4

All prices plus shipping. I take PayPal, Google Checkout, US Check, and Money Order.