Here is one on eBAY right now. It is an english style treeless saddle and since I own one made by the same manufacturer I know this is a high quality saddle and I know how comfy it is for you and your horse. I love mine. I just did a 15 mile ride in mine Saturday and there was zero soreness for me or my horse. A friend uses one just like this one for competitive trail rides and always places high. In fact she was first place in her division.
Stay away from the Hilason Treeless saddles - in that case - you get what you pay for.
I just recently purchased a Wintec 2000 all purpose saddle from Dover Saddlery for $499 which included the entire gullet set plus measuring device. It is pretty light weight and when I went foxhunting for the first time a couple of weeks ago and it rained the entire time, I was so glad I had a synthetic saddle so my leather one didn't get messed up.