Thank you so much for your help Karen, Lauren and Alicia !!
High end used saddles is nice, Fine used saddles also. But you should take a look at famous saddler's website, they often sell used saddles for very reasonable prices.
I know Saddles Direct Co and Used Saddles
I know HorseClicks: http://www.horseclicks.com/used/B/saddles-for-sale And I know CWD also sell used saddles!