Maureen,
The Bankrate site is useful and you You can also go to http://focuspub.com/CF/PRIVATE/CF_frame.html You will find the following information..........
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The site below also has financial calculators.

Bankrate.com aggregates rates from many sources and publishes national and state-level rates:

http://www.bankrate.com/brm/rate/mtg_home.asp

Mortgage professor's website publishes 14 lowest wholesale rates daily.

http://www.mtgprofessor.com/WholesaleData/TablesCharts/Whole…

I think your best bet is to work with a mortgage banker that is trustworthy, because you can go crazy trying to chase the lender with the lowest rate. A trustworthy mortgage will disclose all his/her fees up-front, and will have the ability to tap into the best wholesale rates for your credit profile / area.