eBay has the Harman Kardon Onyx Studio 2 Wireless Portable Bluetooth Speaker (Black or White) for $70 with free shipping. Features wireless Bluetooth 3.0 A2DP v1.3 AVRCP v1.5, rechargeable battery, two 3" woofers, two 0.75" tweeters and 2 passive radiators, 15W x 4 biamplification.
Has good Amazon Reviews.
Amazon has the Dual LU43PB 100 Watt 3-way Indoor/Outdoor Speakers (LU43PB; Black) for $28 with free shipping. Features 100Hz - 20kHz frequency range, 85.5dB sensitivity, 4" woofer, 40mm midrange speaker, and 20mm tweeter.
Has excellent Amazon Reviews.
eBay has the Klipsch ProMedia 2.1 Bluetooth Speaker System (2016 Bluetooth model) for $100 with free shipping. Retail price: $180. Features wireless Bluetooth connectivity, subwoofer generates deep authoritative desk shaking lows, compatible with other devices via a headphone jack and mini plug input.