We financed through Honda, same as we did the CRV. (Okay, so we're lazy.) Our dealer knocked a percentage point off of the financing because we got the extended warranty.
Go to
Honda OwnerLink and there's an eStore that will let you pick out accessories from your dealer and it'll tell you what they charge for it, with and without installation. Compare that with the prices at H&A or College Hills. You can probably knock $1K off the price, just by doing some of the stuff yourself.