I would feel bad asking for a MDD G4 on freecycle since those still have value, but would have no issues asking for any iMacs. CRT AIO machines tend to take up some space and people get tired of looking at them.

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If eBay is any indication, the asking prices of MDDs is dropping quite briskly. I was looking for MDD bits about a year ago and the only ones I was finding for less than $200US were the 867MHz type. Looking this week I have seen even 1.25GHz duals in this range. The supply is growing much faster than the demand. Even later G5s are starting to show up in the $300-$500 range, and quads for less than 1k$.

This might be the time to buy/salvage new world PPCs, before most of them get scrapped. 5-10 years from now they will be getting expensive again.