Sablair I just got these today too!!!! They are WONDERFUL. I was sooooooo excited. This will save us a TON of money on drinks in the park. I plan on freezing bottled water we already bought and bringing it with us each day. It will keep everything cold and can even be laced to the stroller we always rent when not being used.
We saw nearly the same ones at Target today and they were right around what you quoted in your post so we saved a ton of money going to dollar tree.
I also got a ton of Mickey trinkets to give the kids from Mickey each night....hehehehehehe will save on them wanting stuff from the park!