home depot... gutter piping or something along those lines and some rubber sleeves and some hose clamps... i've seen some pretty gangster ones...

mushroom_toy made a pretty nice one... you could PM him for more details.

or just go browse around home depot or lowes until you find some metal or somekind of PVC that you like and fab one up in home depot before you leave... they may even cut lengths of pipe for you if you are nice to the guys in the piping/wood dept. haha