Lowes stocks them and I think they are also $50.

I made one from a round laundry tub you get at walmart for around 5 dollars. If you bury it, you can't see it...or you can stack those split blocks or potted plants around it.
I had an urn last year and some flower pots without holes in the bottom that I planted with clay kitty litter and blk cow and grew lotus in them. I also had a few black trash cans the I had a panama pacific and red flare waterlily in. They did great that way and I put some elephant ears and stuff in fron to cover up the plastic trash cans. I was really doing all this to increase our frog population and it worked.

They have the real half whiskey barrels at Tractor Supply in Plant City for 50 dollars, but they also have these heavy duty plastic ones for 29.99 that look pretty good. I saw them at the store as well.

Here is a link that might be useful: Plastic Half Barrel