The Twelve South AirFly SE is one of those gadgets that can make long flights go by just a little faster, allowing you to eschew the shoddy pair of complimentary earbuds you get with most airlines in favor of your own set of Bluetooth cans. And right now, it’s on sale at Amazon and Best Buy for $29.99 ($5 off), which is a new all-time low.

Twelve South’s entry-level Bluetooth transmitter features an integrated 3.5mm cable, meaning all you need to do is plug it into the seatback…