iMac G4 800MHz 17". Bought in 2010 for $50
The 533Mhz PowerMac G4 Digital Audio with 384mb of ram (I believe), a GeForce 3 64MB and a 30GB HD. I believe I paid $300 for it back in 2003, and the guy I bought it from got it when it was new in 2001 so it was a pretty good buy.
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I still think that 12" PowerBook is a sexy looking machine.