I have a SAT-A50. It came with the RM-Y802 RF remote. Sony sells that for $49 direct (
[Link: sel.sony.com]). It used to run around $90 a few months back.
The little plastic pin on the flip up part breaks quickly (with kids around!). I replaced the pin with a screw and saved $49!
I don't know what the RM-Y130 is.