Amazon has the OontZ Angle 3 IPX5 10-Watt Portable Bluetooth Speaker (OONTZ ANGLE 3 BLACK GRILLE) for $20 with free shipping on $25+ or with Prime. List price: $45. Features IPX5 splashproof portable Bluetooth speaker with volume booster AMP 10 watts power, custom bass radiator, 100' wireless range Bluetooth 4.2.
Has good Amazon Reviews.
eBay has the Definitive Technology W Studio Wireless Soundbar & Subwoofer (BVFBC-A) refurbished for $380 with free shipping. Features three HDMI inputs, one digital optical input and includes remote (also works with app).
eBay has the Bose Acoustimass 3 Series V stereo speaker system (Black or White) refurbished for $120 with free shipping. Includes two 3.5" Virtually Invisible Series II cube speakers and a compact Acoustimass bass module.