Amazon has the Hopday U8 Bluetooth In-Ear Sport Headphones for $23 - $10 off with coupon NIDAST5H (Ends 4/30) = $13 with free shipping on $25+ or with Prime. Features include IPX7 rated water resistance, built-in microphone, CVC6.0 noise cancellation.
Amazon has the ATGOIN Bluetooth 4.1 Headphones (Green) for $34 - $16 off with coupon WFJX9DBP = $18 with free shipping. Features a 33-foot operation range, in-line mic, and working time of up to eight hours.
Amazon has the Proker Wireless Bluetooth Headphones for $40 - $11 off with coupon EKXNROPT (Ends 2/28) = $29 with free shipping. Feature Bluetooth 4.2, up to 2.5 hours of playback, and compatibility with iOS or Android devices.