I got one from Radio shack and one from the Sony store.
This is dual mono RCA (analogs) to a single 3.5mm (1/8"

mini-stereo plug.
if you want a single RCA...i'm not too sure what that would do...mini-stereo is two channel (hence the stereo in the name), and an RCA is only one, so you need 2RCA to 1mini-stereo...I suppose you could get a stereo to mono 2rca to 1rca plug...but then you lose left/right channel and just have a single...