Wintec's are pretty low in cost, but there isn't much showing to be had in a synthetic saddle. I am currently selling a saddle (unfortunately not in your price range, sorry!), and I have posted it on craigslist and tacktrader.com
Sites like equine.com, horsetopia.com, and equinehits.com also have saddle classifieds. Many with pictures so you kind of know what your getting. And don't fear a used saddle! When you buy used, they are already nice and broken in, and the leather will be softer than a brand new saddle. Just make sure you check for tears in the leather and mildew that can get on the billets and in cracks and crevasses of the saddle. That's a sign of a saddle that wasn't cleaned often, Yuck!
"There is something about the outside of a horse that is good for the inside of man." ~ Sir Winston Churchill