Amazon.com has an Advent AW810 900 MHz Wireless Indoor/Outdoor Speaker System for $32.29 with Free Shipping.
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- 900 MHz wireless technology transmits audio signals up to 300 feet through walls, floors and ceilings n
- Dual power mode–plug in the AC adapter (included) or power it with 8 C batteries (optional) n
- 2-way acoustic suspension design with 1″ dome tweeters and 5″ woofer for deep bass n
- 15-watt Audiomax Digital Amplifier delivers impressive sound–even outdoors n
- Water-resistant design for use outdoors and indoors in humid areas like kitchens and baths