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Amazon [amazon.com] and Monoprice [monoprice.com] have Monoprice 25 Watt Bluetooth Stereo Hybrid Tube Amplifier Optical SW-Out on sale for $ 84.99. Shipping is free.
Use code PROMO15 @ Monoprice[list][*]Model 38360[*]Inputs 1x stereo RCA line, 1x digital optical, 1x digital coaxial, 1x Bluetooth®, 1x USB[*]Output Power (RMS) 25 watts/channel into 8 ohms