Amazon with Soundlove has the Monster Superstar S110 Portable IPX5 Waterproof Wireless Bluetooth 5.0 Speaker with Built-in Microphone for $30 - $3 of coupon (check "Apply coupon" box) - $12 off with coupon code N8CCCXM3 [Exp 1/10] = $15 with free shipping on $25+ or with Prime.

This is Monster "Branded" (Monster is no longer manufacturing their own products).