thats if you go to a place that has over heads to pay etc, i know of a place that would be able to do it much cheaper and if its gonna be a group buy then it should be cheaper once again, they even sell the jumper etc.
it really comes down the size, how muich detail is involved etc, if it is kept quite simple with just writing (eg SAU-SA) then there is no set up costs, but when you start getting into real graphic stuff, eg the idea with the sa border line thing put on the back, that will cost a little bit more cause they will need to spend the time on it to make sure it is perfect.
like i said i know of a place and i can go find out how much we could be looking at.