I scored some large (25 gallon he said) plastic planters from my local nursery. They keep them around for putting their bushes and trees in but when I asked nicely they sold me 2 for only $3 each. THey have holes in the bottom and holes around the bottom outside edge for great drainage.
"So we were slammin' beers in the church parking lot..."
"I'm much too young to feel this damn old"