Forum Moderators: open
You're looking for free content. Be aware that you frequently get what you pay for, it makes no difference if the content is syndicated in an XML feed or distributed as PDFs or HTML pages.
That said, there are several search engines for XML feeds, see [faganfinder.com...] . The Open Directory (dmoz.org ) has also been adding RSS links for a few months, though the listings in many categories will still be sparse.
As for rates, I can direct you to BankRate.com as a reasonably reliable source ; see [bankrate.com...] .