Yesterday, we posted a deal on a receiver that could add Bluetooth streaming to your old audio systems for just $9. That deal is still available (with code 4WK8549F), but if you want to spend a few more bucks, this model from Aukey includes a built-in battery so you can unhook from the wall for several hours at a time. You could even use it to turn your favorite pair of headphones into Bluetooth headphones. [Aukey Portable Bluetooth 3.0 Audio Receiver, $15 with code L3F3T3CD]
If you're only interested in Bluetooth headphones, this set has solid reviews, and an absurdly low price tag. [Ausdom S02 Bluetooth Stereo Headphones, $20 with code S002S004]
Update: Whoops, looks like that code is dead. Instead, check out the highly-rated Soundpeats Qy7 Bluetooth earbuds, which are down to $30 right now.
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