Cheap RCA Optical converters?

Hey, thought id ask here since the audio dept. is not my expertise.

My neighbors have a newer LED tv with a optical audio connection available, but their surround sound set up is really old, and the receiver doesn’t support that. It has the RCA white and red cables.

Anyone know if they have a RCA to optical wire or converter so i can take those cables and plug it into a optical cable to plug it into their tv so whatever they are watching on the screen will transfer over to their surround sound?

Try monoprice.
For only $22.40 each when QTY 50+ purchased - Digital Coax & Optical Toslink to Analog Audio Converter | Toslink Switch / Converter
This is about 25, it inputs optical and outputs to RCA. The cheaper ones use a coaxial to optical converter.