Here is the search I use:
http://www.ebay.com/dsc/Airplanes-He...FSRCHMODX:SRCH

I have excluded helis, quads, and a lot of other junk. I am afraid if I refine it more, I might miss some of the good stuff. It shows on average about 2100 results, with a mix of about 40% older kits, 30% newer kits and about 30% arfs and junk.