Meritline offers this Mini Wireless Bluetooth v2.0 Class 1 USB 2.0 Adapter for $2.99. Coupon code "MLCK09T6NL1" drops it to 99 cents. With free shipping, that's tied with our July mention and the lowest total price we could find for a similar adapter by $2. This features a maximum operational range of 60 feet.

Expect this item to take two to three weeks to arrive.