Sears offers the Philips Portable Speaker in Silver, model no. SBA1610/37, for $12.20 with free shipping. (Amazon has it for the same price for Prime members.) That's the lowest total price could find by $2, but most retailers charge $17 or more. This pocket-sized speaker features 2W Rms power, a 3.5mm plug, neodymium Speaker drivers, and also functions as a mobile stand.
Sears offers the Monster ClarityHD Precision Micro Bluetooth Speaker 100 in Silver, model no. AI CLY MBT 100, for $49.99. Plus, Shop Your Way Max members bag free shipping. (Not a member? It's free to sign up for a 90-day trial; otherwise, shipping adds $6.50. Free in-store pickup is also available.) That's the lowest total price we could find by $4, although we saw it for $20 less (via pickup) last summer. It's compatible with most Bluetooth 2.0 devices, has a range of up to 33 feet, and features up to five hours of play time.