These are more medium than large (10 gallon), but I picked up a dozen yesterday at Big Lots - three each of four different colors for $7 each. My intention is to plant blackberries and raspberries in them (those were picked up for $4 each at WalMart). Thought they were fun and colorful, and I'll adapt them for sub-irrigation.
http://www.biglots.com/p/c/serveware...-ice-tub-10gal