They charge a $20 fee on top of all the other stamps/licenses. It's to pay for the upkeep of the blinds, and a couple of the wardens/rangers are good guys and have actually pushed to have a couple new blinds built, with a couple more scheduled. There are maybe 4 spots you can hunt from a boat (I think 3 are boat-in only, not sure), but the water is VERY shallow getting to a couple of them, I'm talking barely over my instep, without a storm tide.
The lottery starts at 5 am. Don't bother getting there before 4:45, since there's no rangers there, and you'll just wait in the parking lot til they show up. It doesn't matter when you get there, either. One person from each group draws a ping pong ball, and that determines the order of picking, not the blind number. I would recommend the $90 for the OSV tag, though, since without it you can only hunt 2 blinds and 2 areas. Any questions, let me know. I hunt there about 95% of the time.
Give a man a fish and he eats for a day. Let a man vote to give himself a fish and he eats until society collapses.