I'm selling my 2007 iMac for $40. I'm the only owner. Non-smoking home.
Includes: the iMac, original keyboard, original remote, original box.
The computer itself is in good condition. No scratches on the screen, etc. The only hardware issue is that the DVD drive doesn't work. It failed years ago and I don't think it can be fixed.
Another important software issue: you will need to re-install the operating system, which might be a little tricky. I was doing the factory reset and was able to erase my data. I tried re-installing El Capitan but I get an error when I try to verify my Apple ID (see last pic). I think this is because El Capitan is old and requires a a work-around where you give the system an older date. Anyhow, I gave up pretty quickly because I just want to sell the computer anyway. But this is a problem you will need to solve.