Hello Yelda,
We have a number of members, like you who are very interested in sourcing Beats by Dr Dre, unfortunately Beats by Dr Dre is a division of Apple Inc.
These headphones and speakers are extremely popular due to heavy emphasis on bass, not to mention the marketing strategy by Dr. Dre himself.
The requirements to source these at wholesale are extremely high due to Beat's desire to protect their brand's value. If you want to source these items wholesale, you'll need to fill out an application on Apple's website.
Check out the links below as you might be interested in these headphones suppliers:
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All the best!