Usually you have to ask a leather craftsmen make it for you, one that specializes in trick saddles (they are few and far between). Occasionally you can find them used...shop circus web sites or sometimes rodeo....but stay AWAY from ebay
. You need a saddle that has a solid tree, tall horn(usually steel) and low seat. Make sure you check all the leathers....especially the stirrups and cinch....make sure it has a breast collar and back cinch...check it loyally every time you plan to ride it. Quick story: I worked with a girl on a show who was doing a suicide drag...the saddle was used and checked every day...yes we used it every day....in the middle of her trick the cinch broke and she was trampled. They had to reconstruct her face and eventually she could ride again....but it is not something that you want to happen to you. Best of luck!!