Ryan,
Now that it is digitized ($25, I'll take care of that) from what i gather, the cost for 10000 stiches is about $4 - $5 dollars per shirt, then the cost of the shirt and the shipping cost to get it to you. Now that its digitized you can also take the digitized file (dst) to a local embroidery shop and get a shirt made. Shirts made as a group may be cheaper but all the shirts will be of the same style.
Dave