Instead of the Costa Mesa Gun Show I visited Turners @ Chino Hills and gave up on waiting for the 9mm M&P Shield.
I transferred my money for the next shipment of Glock 19's for $569 (around $640 out the door ...ouch). The G19's were actually in transit I was told by staff but no firm date was offered.
I figured I had a better chance of those G19's arriving than the M&P Shield at this point.
So those of you wanting a 9mm semi-auto in this market, head on down to Turners, pay your money and take your chances...