One could always do a mean and standard deviation on a group of eBay prices and get a reasonable measure of what a typical price might be. Still, you cannot deny that the extreme prices are actual prices that somebody paid. Just don't expect to get that much every time (or even ever again). Bob -----Original Message----- From: Sellam Ismail [mailto:foo@siconic.com] Sent: Tuesday, January 14, 2003 2:30 AM To: cctalk(a)classiccmp.org Subject: Re: Help with pricing on vintage computers? <snip> There are, and have been, for decades, valid mathematical and actuarial methods for determining the value of a given object based on several criteria, including of course supply and demand. Why should ending prices of eBay auctions all of a sudden supercede that science? <snip>