I have always felt it was better to go out to Kohl's (or similar like store), purchase the shirts and send them out to an embroiderer. Stores like this usually offer frequent sales. Also, the shirts don't shrink.
Alot of shirts that are ordered online you have to allow for shrinking. You also pay a premium for the shirt and the embroidery. Can get a little pricey.
As for your request, noturcuzin....unless you buy shirts direct from the ball company or somebody that has emblems created, you will be stuck with having your designs digitized. The actual digitization is expensive. By me, it's about $80 - $90 to have this done. Once it's on file, it's usually around $7 a shirt to do.
Hope this helps.