I get most of my iMacs from local schools or recyclers. They are usually scratched up but a buffer and some plastic polish shines them up nicely. I am building 50 iMacQuariums right now. I am also making a do-it-yourself page for my website. I'll post it when it's finished but right now I'm just selling them to anyone who doesn't have the time or tools to build one themselves.
I would love to give anyone some tips and advice if they are trying to make their own.
iMacQuarium