Last week we went to both Typhoon Lagoon and Blizzard Beach.
Towels are $1 each at both parks.
Lockers $7 (you get $2 back when you return your key or you get a drink mug).
Life Jackets are free, but you have to leave a room key or credit card.
We arrived at both parks at 10am, and there was no line for the rental shacks.