Talk about a pricing error. Anyone on GAF get lucky and snag one? And kudos to our Canadian brethren; we might not admit it, but we Americans are rather fond of you all. Most of the time. But not about hockey.
So they can cancel the orders? Here in Brazil the stores can't do that, if something was offered online, no matter the price it must fulfilled. Once the online store of a carrier was selling Nexus 4 for R$10(around $4), a guy bought 24 and sold them online.
Bestbuy updates its weekly sales early Friday around 3-6am(mountain time). Sometimes their system messes up and the savings and actual price get swapped. 99% of the time they catch it quickly and will refuse any orders.
However if you live on the east coast the time zone works in your favor as stores will be open as the sales prices get updated. If you do In store pickup and get it right away there's a small chance of taking advantage of these errors.