USA/CAnada Shop@Home are serviced from the same stock/warehouse, so in/out of stock will always be the same.
I was very shocked it would sell out that fast. BUT I would expect you can watch it closely for the next day and it will BE BACK. Anyone trying to get around the 10 limit, might get orders cancelled, putting it back into stock just as quickly as it went out of stock.
If near Mississauga, come visit us at 2410 Dunwin Drive, Unit 5 - your local Ontario LEGO only store - TRUly the largest selection of LEGO around
And out Bricklink store is http://Shop.LastingToys.Com