Hopefully the price of new ball locks will fall as people start to buy more. I've already seen them sold for ~$90 in multi-packs. Given the hastle of some used kegs, I'd pay a premium for new. I think if it dropped to $75 or so it would be great.The ones I have seen for $90-100 new are made in China.
I picked up a nice 3 gallon ball lock in S. TX for $30, at a flea market last month.