You should note that isn't actually Best Buy selling them. That is Best Buy's online market place and it is a 3rd party seller selling them.
You will not find any of those 3rd party sellers items in a Best Buy store.

This is the same as Amazon 3rd party sellers.
Same as Walmart online market place, 3rd party sellers.
And many other companies that have opened 'market places' to their online stores, allowing 3rd party sellers.


Off topic:
Personally I can not understand how the justice department is having so much trouble going after the hosts of these 3rd parties. When they sell knockoffs, counterfeits, stolen, altered, or otherwise unlawful products. You host it, your responsible for the content... period. Yet another case of big corporate America, having the government in their back pocket. It's not illegal if you have enough money!