None of the eBay sellers responded to questions about their listings, including whether they were developers or resellers, and if the latter, how they had obtained the tablets.

According to eBay records, BUILD-distributed Samsung slates have sold on the auction site since Sept. 14, at prices ranging from a low of $1,800 to a high of $4,000. The average price was $2,844.

Because Microsoft has -- the early build that's pre-loaded on the Samsung slate -- to everyone and posted developer tools for downloading, some BUILD attendees may have decided that they could do without the free hardware, and have opted to develop on another device or on a standard desktop.

The standard Series 7 Slate will be priced at between $1,099 and $1,349, depending on the model, and will go on sale Oct. 2.

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at , on or subscribe to . His e-mail address is .