eBay has the Logitech Z623 200W THX 2.1 Speaker System (Refurb) for $67 with free shipping. Retail price: $120. Has excellent Amazon Reviews.
eBay has the Fender Newport 30W Bluetooth Portable Speaker (Black, 6960100000) for $100 with free shipping. Features dual 3" drivers and a 0.6" tweeter, Bluetooth & aptX technology with 33-foot range, 12-hour play time, microphone and 3.55mm auxiliary jack.
Amazon has the Soundcore Motion B Portable 12W Bluetooth Speaker (AK-A3109011) for $20 with free shipping on $25+. Features 12W Audio output, IPX7 Waterproof, and 12+ Hr longer-lasting playtime.
Has good Amazon Reviews.