Though Bluetooth is becoming extremely common nowadays, a lot of us still don’t have Bluetooth on our desktop machines. eCost.com is now having a sale on the Trendnet Compact Bluetooth USB Adaptor. It costs $2.99 after a $10 rebate and instantly enables your PC with Bluetooth 2.0 capability. Plus, it’s extremely compact. Check it out if you’ve been wanting to kick it with a decent wireless mouse, but have been missing the ‘tooth.