It's too early to say,

but I may have a deal with B&N.

I sent materials to their office in New York, and just now got a response saying that they plan to stock my books via a service called Lightning Source.

Although the message was kind of meandering, it did say that B&N would "stock my books."

So that's probably a good sign.

It's still possible that they will not be present on bookshelves, but only available for order.

Not immediately, but presumably before December.