Boy does this bring back memories! I remember paying about 150$ for one of those things used, awhile after the company had folded. It kicked butt too at the time, the iMac really shined in Carmageddon with the Voodoo 2 installed.
Good luck, I sold my iMac long ago.
By the way, I wouldn't say there is *no* resale value on a rev A iMac.