You guys are going to think I am nuts to spend this kind of $$$ on a lock and chain but we had 5 stands stolen last year alone and this will at least allow me to leave one up and rotate the two stands I have left. This is what people in NYC use to lock up motorcycles and bicycles. You can't cut through it and it comes with insurance if you lose something due to theft.

http://www.locks.com/product.asp?0=223&1=224&3=18