Seventh Continent via Amazon offers the Shower-Mate Portable Waterproof Bluetooth Shower Speaker in six colors (Green pictured), model no. S4, for $10.49 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, shipping costs $6.74.) That's $20 off and tied with our March mention as the lowest total price we could find. It features a built-in mic with speakerphone and a suction-cup mount.