Someone just posted in another thread that Newegg is giving 30% discount on orders above 500$ paid in bitcoin. Not confirmed but not denied either.
A good free-market capitalist should buy all their stock with bitcoin and then sell it on eBay with a 25% markup.
Unless their plain (non-discounted) price already is 35% over the rest of the market, of course.
The only exception to this rule is to get some level of privacy, however all transactions need to be reported in order for them to be valid so this would not apply.