I was going to get one custom-made, but that's not really feasible at this point in time.
I'm looking for something for both practice and show.
STALLION HAVANA BROWN WESTERN REINING SHOW SADDLE 16 - eBay (item 190448682646 end time Oct-04-10 15:31:34 PDT)
15 16 17 Premium Tan Western Reining Horse Saddle Tack - eBay (item 360303120754 end time Oct-01-10 17:07:50 PDT)
Rick's Heritage Saddlery - Dakota Reiner, Western
The first one doesn't have the tree I'm looking for, but they have a LOT of them so I messaged them and asked if they had it with a different tree size. The third one doesn't say anything about the tree size, so I'll have to find out about that.