No shit! I wish I could afford one, until then I'm stuck doing the swings and one arm snatches with a dumbell, which is nowhere near as nice!

There are a few places to buy them online, but Dragondoor is the best, from what I've found. They are also the most expensive, but it's a lifetime investment:
http://dragondoor.com/Along the lines of more really cool equipment that you should buy, some gymnastics rings basically improve every single bodyweight exercise. Power-rings training systems makes some relatively affordable ones (in comparison to actual gymnastics rings for competition

)
http://www.ringtraining.com/A really affective training tool that is about as simple as it comes is a sandbag. There are a ton of great ballistic exercises that can be performed with one. Ross Enamait has a great tutorial on constructing your own, which is quite cheap and easy:
http://www.warriorforce.com/sandbagconstructionkit.pdf