Staples offers the Polk Camden Square Bluetooth Speaker, model no. AM7220A, for $35. Plus, Staples Rewards members qualify for free shipping. (Not a member? Click here to sign up for free.) That's $15 under last month's mention and the lowest total price we've seen. (It's also the best deal now by $38.) It features two subwoofers, four 2" long-throw full-range drivers, 3.5mm auxiliary input, and Bluetooth.