Authenticity of makeup brushes on ebay?

Hi there,
I wanted to purchase some Bobbi Brown brushes so I did some searches and came across a ton of brushes on eBay. It was indeed weird how much they were selling them for (one seller has the 18 professional starting at $59) so I did some research. Here is what I came up with. There are many of these so-called Bobbi Brown factories in China selling the brushes in bulk (and other make up brushes too). Here are links to two I found.

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I really don't know if they are actually Bobbi Brown factories (I found Bobbi Brown factories in 3 or 4 cities!) .. Also FYI, Bobbi Brown is discontinuing their long brushes and are in the process of coming out with new brushes. I decided to wait and get the new ones when they come out sometime in the summer. Hope this helps.

Dalicious
 
I've been wondering about the possibility of fake makeup brushes too....there are some gorgeous Dior makeup brushes... but I'm hesitant on purchasing them