Knetgolf sells golf balls. They sell new and used ones. What is interesting about them is how they use eBay as an additional channel. See the following video referring to how Knetgolf managed to win the eBay entrepreneur of the year award.
Dimitris T.
Consumer Value Creation 
nice video!! I think that the praise here goes to Knetgolf.com. Not only they use the fame of ebay to sell their products they also manage to advertsie their company through ebay. However, I do not know how good this is for ebay…..
I’m seriously wondering how they collect all these second hand balls??