Yea... find something that fits, something that you and your pony both can agree on... and then buy it used online or from a consignment tack shop.
My horse goes in a wide tree as well... this saddle I actually bought from a lovely lady here on the forum, but I knew quite a bit about the saddle company before I bought it from her. I love my saddle... and my horse does too! St Georges Tack
(the jumping saddle is the one I bought)