Amazon with w-king has the W-King D8 mini 30W Portable Bluetooth 5.0 IPX6 Rated USB Type-C Stereo Speaker with Built-In Mic for $50 - 60% off with coupon code KGSCOPTM at checkout = $20 with free shipping on $25+ or with Prime.

Features 5000mAh battery, up to 24-hours of playtime and AUX/TF card input.