Sellout.Woot is currently selling the Eee PC 900A for $159 + $5 for shipping.  As far as specs go:
-8.9” Display, 1024×600 resolution
-Linux Operating System
-Shiny White Finish
-Intel Intel® Atom N270 CPU and Chipset
-1GB DDR II Memory
-Intel UMA Display Card
-4GB Solid State Drive Hybrid Storage
If Woot runs out, don’t worry.  Buy.com is selling the 900A for $169.  They’re also offering free shipping until 5/31/09

[This is pure speculation; we don't have any insiders or "ninjas" feeding us information.]
Best Buy is going to stop selling Linux Netbooks.  It would be a surprise if you saw them there after the holidays.  Right now is the time when people begin shopping for holiday gifts and for many a netbook or notebook are high up on the list.  At under $400, netbooks seem very attractive but when they have Linux installed there’s a layer of complexity.  Best Buy won’t want to deal with the return that will happen …