eBay with produtech has the Treblab XR700 Pro Wireless Bluetooth 5.0 In-Ear Headphones with Mic (Purple) for $35 - 5% off with coupon code TREBLABSPRING [Exp 5/24] = $33 with free shipping. Works up to 9 hours on a single charge, IPX7 rated and has a 20Hz-20kHz frequency response range.

Great reviews on Amazon.