SO have B&N, but they haven't expanded far beyond the line of "readers", and quite frankly I don't expect to ever purchase non-literary related merchandise from a bookseller...
That said B&N embraced ebooks MUCH more quickly and adroitly than Borders and even arguably than Amazon so far... however the limitation of competition is worrisome especially couple with the dimwitted publishing industry forcing agency pricing for INCREDIBLY INFERIOR product.
i.e. really all of the LARGE booksellers for years have had some non-literary product offering, but to no real volume... e.g. they've ALWAYS offered P&P RPG game books, etc and most puzzles, etc.