this is the saddle I found that I would like to get. It's on ebay WESTERN ENDURANCE SADDLE PKG MAHOGANY 15" * NEW. All the arabian saddles I have found r to much money for me to spend right now.
I would really try to stay away from new saddles on ebay. From what I've heard and seen, they usually have oddly shaped trees/broken trees/pokey bits on the underside/or they don't hold up at all.
I did some looking (hope you don't mind) and found some used Arab tree saddles (used saddles are great for us lower price range people, you get a great product for cheap! :) ) on ebay that might just work for you.
I'm not sure what size seat you need so I was just searching for 15" saddles since that's the size you said you were looking at.
This one might be a little big for you since it's a 15.5inch seat but it might just be comfortably big. 15.5" ARABIAN PLEASURE/ TRAIL WESTERN SADDLE | eBay
I'm not sure if this one will be out of your price range, but it does have free shipping. It's not an Arab tree but this is the one I use on my Arab mare that fits her pretty well. And it's "Buy It Now", no bidding war! :)
However, it is a 17inch seat so it might really be too big...I'm not sure. BIG HORN BARREL, TRAIL WESTERN SADDLE BLACK LEATHER / CORDERA SZ. 17 IN. | eBay
And here's another Bighorn, 15inch seat, looks brand new but for half the price!
I'm a huge fan of these saddles for trail riding.
This one looks really really good for the price, I'd seriously consider this one if I were you. :) 15" BIG HORN BRAND COWBOY WESTERN SADDLE WITH CORDURA SKIRTS+FENDERS ;HORSE TACK | eBay