My fiancée Pantera as has brand new Apple iMac for sell. The machine was released in 2008 and bought in July 2008. Pantera has used it for 3 days only and put it back to the cartoon box (boxes from Apple are really cool ;-)). It is standard specification: Intel Core 2 Duo (2.8 GHz); 2 GB DDR2 SDRAM; HDD 320 GB. We have left the machine in our apartment in Poland, but we can ship it internationally.
How much? It’s the matter for negotiation but the prices is surely much lower than average current price.
Here is complete review of Apple iMac (24-inch, 2.8GHz)