CSHope via Amazon offers its CSHope Bluetooth Car Adapter with FM Transmitter for $25.99. Coupon code "ALXVAGP9" cuts that price to $20.79. Plus, Prime members bag free shipping. That's $5 off and the lowest price we could find. It features a built-in microphone, dual USB inputs, and a 3.5mm audio cable. Deal ends January 30, 2018.