At least three repliers in this thread have said "just pick up the phone" if you have problems with the dealer website.
That's archaic thinking.
...Ignore this and you WILL lose business.
With all due respects, that is such hyperbole. And I'm being as polite as I can here.
Look... We'd all love to do our one-click shopping wherever we happen to visit on the web. But you're comparing apples and oranges here. Amazon is in the business of moving as much stuff as they can. And when they're sold out, they order more.
Haven't you heard about BTO? We're a niche market on the best if days, and shops have only so much inventory. I called a shop the other day for an MTH item, and they actually sent me looking elsewhere 'cause they had already sold their items they pre-ordered for customers. So do you really think these kinds of businesses are gonna upgrade their websites overnight to something like Amazon's?
I may be old-school, but I still like the phone... still know how to talk on the phone (unlike some folks who dribble over keyboards and text on iPhones all day long).... and I find communicating by phone (the old fashioned way) to still be highly productive. 
Are these fancy web sites nice? Definitely. Am I expecting train shops to run out and upgrade their site 'cause if what they may read here. I don't think so. They'll do it when's time and funds permit the investment. Meanwhile, some are running highly successful businesses without one-click shopping, because they understand their business model and their customers buying habits.
If we think a business is going to be a smashing success solely because of a fancy website, we're sadly mistaken.
David
