Online seller and eBay PowerSeller Eforcity made it onto the Inc 500 list of the fastest growing privately held businesses (link).
According to this chart, the company has annual revenues of $19.2 million (that's across eBay, Amazon, Overstock and its own website, I presume). But what blows my mind is that they have 78 employees. That's a lot!
Two other eBay PowerSellers have made it on the list: Grapevinehill (I think they did - I couldn't find them) and Abacus (link).