They still had them when I was there at the start of the month. I don't remember the exact price, but somewhere around $25 comes to mind. I had. Iced luck with them syncing, but if I turned them off and then back on they were fine.
In terms of being worth the price...I thought they were a neat novelty, but I only had them with me the day I bought them. They were uncomfortable to wear (heavier because of the battery pack) and the person wearing them can't really see the lights. They aren't really wide spread in the parks, so you don't see very many during the shows (maybe one or two). Also, I have to admit, I find them distracting/annoying when someone is wearing them so I try hard not to stand behind someone wearing a pair.