It's just like kickstands, for many bikes that's an option also. My LBS does carry everything I could imagine wanting for my bike plus a few other things. When I bought my EZ Sport, I added fenders, computer and a pack bag. Even with all these things added on, I discovered he sold me everything for more than 20% less what some shops sell the stripped down bike alone. I guess I got lucky. But it goes to show that it pays to shop around.
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"The difference between genius and stupidity is that genius has its limits."
-- Albert Einstein