If you're looking for the perfect pair of Bluetooth earbuds under $100, the JLab Epic2 Wireless Sport Earbuds are a promising contender. They sound good, they don't cost too much, and they stay put while you're working out. So what's the problem? They have a troubling number of poor user reviews online, indicating some issues with long-term durability.
Of course, that's true of just about every pair of Bluetooth earbuds around.