For new parts, these are some of the best sources:
davidsilverspares.com
servicehonda.com (as mentioned above, and you'll need the part numbers)
crc2onlinecatalog.com
loudfastugly.com
denniskirk.com
For used parts, if you can't find it at the local scrapyard or from somebody in this group, then eBay is about your only option. For what it's worth, I only bid on items when the shipping is listed up front. That way I can figure that into the total price I'm willing to pay and I don't end up spending more than I wanted to.