I use one of these so I can hear the music inside and still send an audio feed to my FM transmitter
3.5mm to RCA Stereo Adapter Cable for !!79 cents!! + free shipping
New: 3.5mm to RCA Stereo Adapter Cable for 79 cents + free shipping
Meritline offers the 3.5mm to RCA Stereo Adapter Cable for $2.99. Coupon code "MLCK1F23NL1" cuts it to 79 cents. With free shipping, that's the lowest total price we could find for such a cable by a buck, although we saw one for 10 cents less back in August. It splits stereo output from a 3.5mm stereo jack into two RCA connectors.