I just got one from KEH used for 15$ it is the same clamp as the 400T uses. I think it was the only one they had it is no longer listed on there site. B&H has it listed new try the link below.
B&H new http://www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details&; Q=&sku=40970&is=REG GOOD LUCK JD
