Nine dollars isn't all that unusual...there's a few places that charge that amount...unless like Booger asked, is the posted price different?
It was not 24-7 or 23-7

...it was essentially vacant land (there were squatters there for years)...located next to Rooms Negril.
If your sister was there the other day...maybe she can find out. I've only ever seen the cabanas used once...but I'm not on the beach a whole lot.