Roav SmartCharge T1 Bluetooth FM Transmitter | $20 | Amazon | Clip the 5% coupon and use code ROAV68T19
If your car is too old to have Bluetooth, or even an AUX jack built in, an FM transmitter is probably your least worst option for getting audio off of your phone, and onto your speakers.
Anker’s Roav SmartCharge T1 connects to your phone over Bluetooth 4.2, and then retransmits that audio to your choice of FM stations (or over AUX, if you prefer). Get it for your next road trip for just $20 by clipping the 5% coupon and adding code ROAV68T19.