Found this interesting article about the Expresso publishing system John Dishon and others have mentioned. Now they are working out a system with a self-publisher to walk into a store, have your novel on software, pay your fees and walk out with as many books as you want within hours (if not sooner).
You can easily imagine this in libraries--even in convenience stores. The revolution has begun.
http://www.publishersweekly.com/article/CA6711069.html