Does anybody know of a store that buys empty ink cartridges?

i have 4 empty ink cartridges


a lexmark 32 black


a lexmark 26 color


and 2 hp 23 color, and i was wondering if anybody knows where i can sell them.Does anybody know of a store that buys empty ink cartridges?
Staples trades them for credit!





I have not seen anyone buy them. Sorry!Does anybody know of a store that buys empty ink cartridges?
You can get $3 credit for every empty cartridge up to $30 a month. I have been getting 11 free cartridges every month for the past 4 months after reading http://www.ccs-digital.com/freeink.asp
They don't buy them back You take them back to be recycled