Anker SoundSync Bluetooth Transmitter/Receiver | $33 | Amazon
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External Bluetooth transmitters and receivers with 3.5mm jacks have been around for years, but this model from Anker raises the bar with support for optical (SPDIF) audio.

The little box can both receive and transmit Bluetooth signals, and includes SPDIF in and out ports to connect it to your TV or high-end audio equipment. Plus, it can even pair to two pairs of headphones simultaneously when transmitting, which would allow two people to, say, listen to the same TV over headphones to avoid waking up someone in the next room. It even includes an optical audio cable, which doesn’t normally come cheap. It normally costs $46, but it’s marked down to $33 right now, matching the best deal we’ve ever seen.