This ECOXGEAR EcoBoulder 100 W Portable Waterproof Bluetooth Speaker drops from $249.99 to $179.99 with free shipping at Academy Sports. This is the lowest price we could find for one by $30. Costco members can also find these speakers for the same price at their local store. These speakers are 100% waterproof, have 100-Watt dynamic powered amplifiers, and a 10-hour battery so they're perfect for outdoor events, tailgates or large work-spaces. Sales tax is charged in most states.