Post in the Wanted section of CL. We have had ads there and have gotten a really good response. Basically our ad was this -
"We recycle old computers, electronics and cell phones
We will take any/all of your old computers, electronics and cell phones. We recycle them and nothing ends up in the landfill. We destroy the harddrives as well. Please contact us if you have any that you would like to get rid of."
We will also take monitors if anyone is getting rid of them because we take them apart and I recover the insulated wires and copper. I have people that take all the scrap that I do not use, so we do not send any to the landfill. Also, make sure and let people know while you are picking it up that you will take all the power cords also. These sell as insulated copper wire.
You will be amazed how much stuff you can collect from these people. While talking to them, we have also collected old ceiling fans, tv's, satellite boxes, vcr's and all kinds of goodies.
Good Luck and you will probably need a couple of email addresses to keep a current ad going. We haven't placed on in a month and we still get emails. I never put my phone number. We do it all by email.