Came across an interesting sale on the Nook 3G thanks to a post over at MobileRead.
Barnes and Noble is selling refurbished Nooks on eBay for $99 with free shipping.
It looks like the $99 3G/WiFi Nook will be at that price for two more days (Nov 08, 2010 14:00:04 PST) or until they sell out.
Barnes and Noble also has some other options listed with longer sell dates. A WiFi-only Nook is $119 and is set to expire November 18th, as does another listing for a 3G/WiFi Nook for $149. All are manufacturer refurbished.