One store reports ten in stock.
I've called several Authorized Apple Campus Retailers in various states and come up with the following information. One Texas store reported getting about half their ordered shipment- ten models were reportedly in stock. Other stores were less forthcoming about their current supply.
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One store in Illinois said that they were planning a launch party, but admitted to a "fairly limited supply". He added that "We have many more being shipped to us within the next week or so." Which would put in-store resupplies well ahead of the expected iPad 2 ship dates.
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"Limited stocks" were reported by every store I called. None of the employees expected supply to last more than a few minutes.