Fosi Audio via Amazon has Fosi Audio BT20A Bluetooth 5.0 Stereo Audio 2-Channel Amplifier Receiver on sale for $49.99 when you clip the $30 coupon on the product page. Shipping is free.
Specs:
- Power Adapter: 24V/4.5A
- DC Input Range: 12-24V
- Terminating Impedance: 2 Ohm – 8 Ohm
- MAX Power Output: 100W x 2
- THD ? 0.04%
- Frequency Range: 20Hz – 20kHz (±1 dB)
- SNR ? 98dB
- Input Sensitivity ? 280mV
- Input Mode: Bluetooth and RCA
- Bluetooth Transmission Distance: Up to 50 Ft