http://www.fundingfactory.com/. They provide free shipping labels...you collect and ship used printer cartridges, old cell phones, replaced electronics, etc. and get $$ in return. (Or, businesses can ship directly using the free labels and specify that your organization earn the donation.)
If you decide to sign up, please list GLAD (ID# 104044) as the referring organization at the time that you register your organization. We'll get greatly appreciated bonus points that equal real money, especially if they receive your first shipment of recycling items before the end of 2012.