Newegg offers this pair of NXG Weather Resistant Wireless Indoor/Outdoor Speakers
, model no. NX-WRW-6B, for $49.99
for shipping. That's the lowest total price we could find by $18. They feature a frequency response of 55Hz to 20kHz, 6" woofer, 1" tweeter, and Bluetooth streaming with a range of up to 33 feet.