I just bought a GVP G-Force 040 for $150.00 with 16Mb of RAM. I paid too much, but had broken the 030 card that was in the A2000 I use.(my dog is getting expensive - long story)
Prices are nuts these days. They can change on a daily basis! Personally, If I was to list it on eBay, I would use a $150.00 buy it now/best offer and see what happens.