I don't remember it costing that much, maybe $20 at the most???
We did the one at DHS. There was a very nice CM who help my DS 5 build his light saber. We didn't know about the one at DTD. There really wasn't a big crowd, so my son probably got more personalized attention than normal.
You may want to be prepared with 2 extra C batteries. They give you some when you check out, but they were horrible. Ours also seems to work better without the color crystals they give you.
Have fun!