Magic Kingdom Lockers

[Sparrow'sLady]

Does the availability of lockers, especially on a party day, dwindle quickly? My thought is they probably do now that Disney no longer offers resort or front of the park delivery.

Trying to determine if I should get a locker as soon as we enter the park?

Also, I am guessing I can open and close it as many times as I need in a day? It is not a one and done?