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Apple online store has updated early and is now offering the iPad 2 for order. Estimated shipping date for iPads are from March 18 - March 25th. There is only "standard shipping" available.
Online sales were scheduled for 1am Pacific but appears to have started early. Apple is also selling the iPad 2 at their retail stores across the country, as well as Best Buy, Target, and Wal-Mart.
http://www.macrumors.com/2011/03/11/...line-ordering/