What about home made?
I've got one that says
Sound & Lighting
which cost me a black shirt!
I don't know why Phantom but that's really got me laughing. It's so cheap. So simple. Actually, the kits you can get for home ink jet printer iron on T's are a lot of fun. Unfortunately they don't last well in the washing machine and they won't work on a black shirt... but you can have a lot of fun making your own shirt for very little cost.
We did a production of "The Miracle Worker" last year, and part of the set was held together with an enormous wad of gum that all of the crew added to.