Update 10/09 10 4:35 p.m. PDT - Please refer to the following thread for updated sale times due to issues with the BlizzCon store: 48-Hour Sale for BlizzCon Attendees Delayed

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Heading to BlizzCon 2010? Planning to purchase some souvenirs at the show? From October 9 at 10 a.m. Pacific time until October 11 at 9:59 a.m., BlizzCon 2010 ticket holders will have the opportunity to purchase select BlizzCon 2010 store merchandise online (while supplies last). Items purchased through this sale will be shipped directly to your home, giving you more time to take in the panels, tournaments, and other events at the show. To participate, log in to the online Blizzard Store during the sale hours using the Battle.net account provided when you purchased your BlizzCon 2010 ticket (viewable in the buyer's Order History), and head to the More Products section. A second 48-hour sale for BlizzCon Virtual Ticket purchasers will be taking place beginning October 13 -- place your order by October 10 to participate.

http://us.blizzard.com/store/