I have called Staples, Office Max, Office Depot, Best Buy, Wal-Mart and Sam's Club in my area. Not only do they not have any, none of them know if or when they will EVER have any. Staples and Office Depot said that some stores will get them, but not all (I live about 30 miles from Nashville) and that there was no guarantee that I would be able to get my hands on one from any stores IN THE AREA. Best Buy wasn't sure that they'd ever carry it. Wal-Mart and Sam's Club thought that I was looking for an iPad. Apparently, the Walton's were unaware anyone else made a tablet. Office Max was oblivious to anyone selling anything.
GameStop is the only place I didn't check. Their website doesn't seem to be very helpful and my last face-to-face encounter with them was mindblowingly bad (I tried to cancel my pre-order for Guild Wars 2, since it happens to be coming out 3 months after the date they posted) and I'm not sure I can handle another dose of "customer support" from them.
That aside, if any of these places do get any in stock... how many 16gb versions would you assume to be in the wild? I'd really love to have a Nexus 7 and I would really love to snag one while I can get 25 dollars of credit in the Play Store, but I really don't like giving money to someone and then hoping I see my product in the next month.
Edit: It looks like they have removed the 3-4 week delay and simply made it unavailable for purchase. ARGH! I've been waiting months for this thing. =( I'm tempted to to just got pick up a TF300, now.