Link your smartphone to your car's speakers via Bluetooth with Anker's Roav Bluetooth receiver on sale for $12.99 with the code ROAVB2AN. Without the code, the receiver sells for around $16 and hasn't dropped from that price in several months.
This is a simple device that's just plug-and-play. All you have to do is connect to your car's aux-in port. The advanced CSR chipset gives you a stable wireless signal with superior sound. The Bluetooth works up to 33 feet away for like limousines and stuff... I guess. You'll also be able to receive calls and talk clearly thanks to the built-in mic with noise cancellation. The receiver is covered by a one-year warranty.
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J.D. Levite has been in the deals game since 2012. He has posted daily deals at Gizmodo, The Wirecutter, The Sweethome, and now covers deals for Android Central, iMore, and Windows Central. He was there for the first Prime Day and has braved the full force of Black Friday. If you cut him, he bleeds savings. But don't try it for real. That's a metaphor.