When I was at Highbridge for worlds I bought a set of minis that were color coordinated for the courses that were in use. Do they still sell the mini sets?
I assume for worlds the shop was actually stocked. I saw some of those when I was there, but only sold singly. There was really not much in there when I was there. Maybe 30 discs max, a box of minis and coozies, and some shirts and towels. For reference on why I said overpriced: friend of mine bought a towel for $30.