Blizzard is offering those who bought BlizzCon 2010 tickets, even DirecTV virtual tickets, the opportunity to buy exclusive BlizzCon merchandise online for 48 hours this weekend. This sale was delayed until Sunday, Oct. 10 at 10 a.m. PST. As of now, we can confirm that this sale is now active.
You can buy the items by going to the Blizzard Store and selecting More Products. Good luck getting your items!
Edit: Only Battle.net accounts that were used to purchase tickets are able to see the sale. Virtual ticket sales are on Wednesday.