Hone your search skills and expand your range:
USMB For Sale forum: http://www.ultimates...rade-or-wanted/
Post a "Brat Wanted" add in the For Sale, Trade, Wanted forum:
Autotrader and Ebay are long shots, ebay is good if you don't mind paying top dollar for what you get.
In general expand your range a LOT - the northeast and midwest Brats are mostly gone due to rust and the ones still available are prone to rust issues. You may land on one locally but you'll greatly increase your odds by looking south and west where rust is not an issue and you'll likely end up with a vehicle that's in better condition and lasts longer too.
I am into XT6's and the last two I bought were from thousands of miles away - Texas and California, because I'm tired of rust. Well worth the effort.