My 12 yr old had a hair wrap at OKW last month. They were only there on week-ends and the charge was $1.50/inch plus extra for beads. This is the second year in a row that the wrap has come out shortly after we got back from vacation. They used to last up to a month!
This is the last year we try it. It's gotten too costly for the limited time she had it in.
Also, be aware you have to pay cash. They don't take visa, etc at OKW.