Anyone ever pre-order from Amazon? They accepted my pre-order 2 weeks ago for the Sigma 50 1.4 and today I get a note that I didn't get one and I have to wait until late August. That's just weak. How hard is it for a company like Amazon to turn off pre-orders once allocated stock is exhausted? B&H doesn't have this problem. I sent them feedback today and just wanted to see if anyone else had the same experience.