This AUKEY SoundTank Bluetooth Speaker drops from $54.99 to $39.99 to $34.99 using the code AUKEYSK9 at Amazon. Shipping starts at $7, but is free using an Amazon Prime membership. Elsewhere, the lowest price we found for this speaker was $48, so even with the shipping added, this is still the best price for one by $6. This Bluetooth 4.1 equipped speaker has a 30-hour battery life and a thick silicone casing for drop protection and water resistance. Sales tax is charged in most states.