Free: Contests & Raffles.
I might know of a place that has a few essentials stashed away:
Well being illegal I couldn't possibly tell you to just use a 4" PVC pipe that is capped at both ends. One end being screwed on like a threaded cap on one end. (makes it water proof). if it wasn't illegal that is.
If this is illegal, wouldn't geocaching fall under the same guidelines?