20% of sales on Red Dress Boutique are processed by Amazon

"Amazon, which is usually opaque on numbers, did not disclose how many merchants actually use the service in some form, although the four-year-old online clothing site Red Dress Boutique, for example, reports that 20% of all sales — at least $2.8 million based on back-of-the-envelope math — are now processed via Amazon."

Source: Mashable, 16th May 2015