Newegg offers the Asus Bluetooth 4.0 USB 2.0 Adapter, model no. USB-BT400, for $2.99 with free shipping via the directions below. That's tied with our June mention for the lowest total price we've seen. (It's a current low by $4.) It features transfer rates up to 3Mb/s. Deal ends September 14. To get this price:
  1. View the Asus Bluetooth 4.0 USB 2.0 Adapter for $13.99
  2. apply coupon code "EMCENEM36" to drop it to $7.99
  3. redeem this $5 mail-in rebate for a final price of $2.99

See all Newegg Coupons.