What is meant by the term "B stock"?

Yes they can also be refurbished. Refurbished, for what ever reason a new unit is sent back to the factory or a factory authorized service center,not a dealer sevice, to repair or correct a defect.

Thanks to all of you for your response. Although the question still begs to be answered, should it be disclosed to a buyer that the unit was originally a B stock item? In my case, the original box says "B Stock" on all four sides, but one wouldn't know other than that. And yes, mine did come with a factory warranty for everything except "cosmetic items", although that isn't an issue, as it is flawless.
Thanks again for your info.

Would you like to know if you were purchasing a "B stock" unit? I think the answer to that question for most would be yes.
A lot of times "B stock" comes in a white box, instead of the usual brown cardboard.

Yes, I bought a Sony B-stock refurbished piece and it
broke RIGHT AFTER the warranty expired. I sent it back
to Tweeter, THEY sent it to Sony to fix, and
SONY LOST IT!! 4 MONTHS LATER, STILL NO PIECE!
WHAT DO I DO?

It took me about 2-3 months to get my Sony SCD-777ES SACD player refunded from Sony. You have two options with Sony, if the item is a current item, they will replace it with a new one free of charge, option 2 is if the item is no longer in production, they will give you the replacement value or better yet, ask for another model that is current and then sell it on Agon for more then the replacement value of the old unit. That is what I did anyway.

You have to keep on the Sony service center at least every week and ask what your options and how long it will take. Keep up the faith, Sony will do the right thing even if it takes some effort on your part.

Happy Listening.