Like the idea, but don't want to spend the money? There are two different ways of making your own...
What I did:
Take a hanging planter and remove the water drain plate, if there is one. Make one of the drain holes big enough to put the main plant stalk through. Fill up the planter halfway, and make sure the bottom 1/3 of the stalk is packed in soil. Fill up the remainder. The benefit of this way is that you can plant stuff on the top part of the planter, too. This is what it looks like:
The other (cheaper) way is with a 2-liter soda bottle or a gallon vinegar bottle. You cut the top off and invert it, pushing the plant through that so the roots are inside.
The instructions for both ways are at this website:
Since neither WalMart or King Soopers had the actual planters, I improvised, and I think it turned out rather well.