TechRabbit offers the refurbished HMDX Jam Thrill Wireless Bluetooth Stereo Speaker in Black/Red or Blue, model no. HX-P320, for $9.99 with free shipping. That's tied with our expired mention from six days ago, $33 under the lowest total price we could find for a new model, and the best deal we've seen. (It's a low for a refurb by at least $10 as well.) It features a splashproof, dual-speaker design, up to six hours of playtime, microphone/speakerphone, and 30-foot range.
Note: A 1-year TechRabbit warranty applies.