I have lots of letters in my name, 2-digit numbers, captain "C", 2012 Final patch sew-on were all just $49.98 which I think is a great deal.
There's nothing to it, you go in the store and at the front counter will fill out a form with what name/number/C or A/patches/nameplate or no nameplate/etc and where they go. The people I worked with obviously do this all the time and knew what they were doing.
Due to the problems I had in the past I thoroughly inspected letter, number, and 2012 patch and was very satisfied with the materials and work. If I do another sweater I'd go back to Monkey Sports for the work.