Good Prices on Generic Bluetooth 1.1 Equip...
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http://www.compgeeks.com I saw these for sale
BLU1-DNGL - Retail Box - BlueTooth USB Dongle - $49.99
BLU1-DNGL-WB - Plain Box - Bluetooth USB Dongle - $39.99
The USB part is right on the edge of the device, so its far from a stealth install, but it looks like an extender cable is included/can be used.
Cheap and small... I might pick one up... onc ei see if this is really as cheap as they get...