As one of its daily deals, Amazon offers the Boss Audio Off-Road Amplified Bluetooth Sound System, model no. ATV25B, for $119.99 with free shipping. That's $38 under our January mention and the lowest total price we could find by $39. It features a maximum RMS output power of 450 watts, 6.5" marine-grade speakers, 1.5" weatherproof tweeters, internal amplifier, Bluetooth, strap, and zip ties. Deal ends today.