Blessings' post made me think to write this. If there's a Staples around where you live and you're a member of their rewards program they will give you a credit for every empty ink cartridge you bring in to the store. (Can't remember exactly but it's $2 or $3.) It's free to join and you can do it online:
https://www.staplesrewardscenter.com...gin/Login.aspx) Staples "cash rewards" go out 4 times a year but I think they only issue the coupon when you hit $10.
It's possible that other stores besides Staples do this too so it pays (literally) to ask! It's going green 2 ways -- recycling AND cash!