I've heard goo things about the Martha Josey saddles. I'd stay away from Alama and Dakota. They're a little lower quality... ok for starting but arent made very nice. I, personally, wouldnt buy something for over $500 that isnt going to last or that is going to sore up my horse's back.
Or you can try
www.barrelhorseworld.com and go to the classified tack section.