newegg offers the ASUS USB 2.0 Bluetooth 2.1+EDR Dongle, model no. USB-BT211, for $3.99 via the directions below. With free shipping, that the lowest total price we could find by $9, although we saw it for $4 less in our mention from last spring. Rebate ends January 31. To get this deal:

1. Add the ASUS USB 2.0 Bluetooth 2.1+EDR Dongle to your cart for $12.99
2. apply coupon code "EMCNJNG55" and it drops to $8.99
3. redeem this $5 mail-in rebate to get it for $3.99