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.
eBay has the Bose SoundLink Color II Bluetooth Speaker (Soft Black, 752195-010R) refurbished for $80 with free shipping. Retail price: $130. Features a rugged, water-resistant, soft-touch silicone exterior.