There are a few versions of the Cornerman bag stand around. Ringside has several models on their website; prices still start around $200 or so, off the top of my head. And you still need a certain amount of room to set it up and use it.300 DOLLARS!?!??!
The freestanding bags are a little more forgiving in space; when you're not using it, it's only as big as it is around, no legs, support arms, etc. But they're kind of a pain if you don't have enough weight holding them in place. They are better for practicing circling, since it's not real common for any hanging bag setup to allow you to really circle the entire bag.