I agree Ridge, that may be an unfair assumption. Most of these people don't do their own websites, most of them are done by a pro, or even a friend of a friend etc. So unless the owner is the one doing it, and can keep up with his inventory on a daily basis, I doubt that he would be able to keep it 100% all the time. Unless of course they are like Wally World in which their server is tied in with their inventory control.
Why don't you ask if he can make you one, it may be a discontinued item on the inventory stock, but he may just make you one out of the custom shop. It could be simple economics. That particular model may not have been a big seller, and they retooled for other products, and it wouldn't be cost effective to retool everytime an order came in.