Try this site as a starter and look at the kits.
http://brodak.com/control-line-kits.html
Also here is another:
http://clflyer.tripod.com/
Tower Hobbies has a few UC ARF's also.
I still have a flyable Sterling Ringmaster with a Fox .35 stunt that I built in about 1959 or 60. Last flew it in 2007. They will last a long time if you can rebuild them!
Good hunting ....