How much do saddles cost?

Well, my saddle got broke today. A stirrup torn off and the seat ripped off. I let my Mom ride him, I walked her around for a little bit and she wanted to do it herself, so I don't her what to do if he started trotting and she fell off at a slow trot. When she fell, the saddle slipped. Tango took of at a gallop running and bucking the saddle. The stirrup fell, then he kicked the seat out of place. He fell down once. =( He is okay though, he has been taken care of and she'll come back tomorrow and the next day, and the next day, until he is completely healed. He has a tender spot of his back, scs and cuts on all four legs. The good thing is no serious injuries though. =) =) Thank God for no serious injuries. My saddle isn't usable anymore, so me, Pam, and Tango (not to sell him), are going to the auction and finding him one that fits him, any idea of how much it will cost? Just so I know how much money to bring with me. Thanks!