There is a way to get a printed copy of a B/X Combined book through Lulu. You combine the B/X PDFs into one document as suggested on page X3 in the Expert book and have it printed out through Lulu with a cool
cover someone created. Unfortunately, I haven't been able to create a PDF that Lulu will accept. It keeps telling me that the pages are different sizes and oriented in different ways. Hopefully, I'll be able to figure it someday. In the meantime I've resorted to making my own. I printed out the books, combined them and bound it with my comb binding machine.