Update:
Just got off the phone w/Mark from CS, and my order is still active in the system. According to his report, there are about 4000 backorders, and the shop is expected to receive 5000 by the end of the month.
Meanwhile, I've got lots of other guns to shoot. I'll still practice with the Shield, but with not as many rounds. I really like having at least five magazines for each of the pistols I take out to the range.