Amazon has the SoundPEATS P5 Bluetooth Stereo Speaker With 360 Degree Surround Sound Stereo Speakers (SP-P4-BL-US) for $29.99 - 5% off (Clip extra savings coupon) - $6 off with coupon NTC3X3FA = $22.49 with free shipping. Delivers 360 degree omni-directional high definition surround sound while you are walking, hiking, cycling, partying, picnicking, or lounging around the house. Has good Amazon Reviews.
Amazon has the Unitek FBA_Y-B101GY Aluminium Stereo Portable Bluetooth Speaker (Gold) for $10.99 - $6 off with coupon IPSLZEP5 at checkout = $4.99 with free shipping for Prime members or on $25+. Has good Amazon Reviews.
Amazon has the TaoTronics TT-BA07 Wireless 4.1 Bluetooth Transmitter refurbished for $7.99 with free shipping. Retail price: $18.
Amazon has the KEF LS50 Mini Monitor Bookshelf Speakers (Racing Red) for $999 with free shipping. Features a 79Hz to 28kHz frequency response.
Has excellent Amazon Reviews.
eBay has the Rockville 5.1 Bluetooth Home Theater System (HTS56) for $150 with free shipping. Features a subwoofer with built-in receiver, a remote control, and five speakers.