SMU Flags: This place has a good assortment, and they're all the correct pony:
http://www.collegeflagsandbanners.com/s ... 8_ctg.html
Appreciate your concern on displaying the proper pony. Someone fell asleep at the wheel a long time ago and allowed the phony pony to get into the official catalog of logos that manufacturers use. SMU is more diligent about enforcing the logo now, but there's still a lot of inventory out there with the phony pony.