According to the Xbox 360 DVD Drive Database, it appears Xbox 360s outfitted with the much-anticipated Jasper chipset have finally started showing up in stores and at online retailers.
The key things to look for when buying a new Xbox 360 with the Jasper chipset is a manufacturing date (MFR) as early as 2008-08-06, Lot 8031 and up, and Team CSON.