Was looking for a set of BT headphones and came across this pair. Under $10 with promo code so it is a good bet for a the gym for me.
Mixcder PRO911 Bluetooth v4.1 Wireless Stereo Headphones
Original price: $24.99
Promotional Price: $9.89
Promo Code: RAZUS9KV
It has a Fakespot rating of A