Are you looking for Western? I have a Circle Y synthetic (Park and Trail) that has been lightly used but fits my extremely short-backed 14.3 hand Arab. I just don't like Western. PM me if you'd like, and I'll send you pictures. Not sure what seat size you are, it's 15." You could have it for a great deal. :)
"Full Wither (FW)/Arabian (Arab) - Flared out front and rear to allow for full or mutton wither with no pockets. The resulting bow enables this fit to conform well to the short Arabian back having wide withers rounding out into the shoulder."
Works well for some Arabians, but not the high wither type. Something folks could consider is the Steele "Fit to the Horse" program:
If you are interested I could give you the contact details for a saddle maker in Amman Jordan who makes traditional Arabian saddles, they go for around 400 to 500 Dinars and are designed to fit Arab horses, really nice looking saddles too, he makes them all by hand himself even does all the embroidery and everything himself. They are kind of like a gaucho saddle but without such a pronounced cantle or pommel, and they have large decorative skirts that hang down each side and go over the horse’s rump. But look more or less the same underneath.