If you really want OEM, then see if your local Honda dealer has an online site. This is becoming a very common practice among dealers.
At least one of my local Honda dealers gives me the online prices (knock on wood). I do not pay shipping/handling. I do pay local sales tax. They usually have the parts for my 91 Civic in stock and so available immediately.
OTOH, I bought a rebuilt master cylinder this past weekend from Napa. It looks identical to the old one. It's working great, and it has a limited lifetime warranty. (Thanks to Tegger for his site with tips on replacing the m/c.)
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