Mortgages, auto loans, bonds and bond funds, home equity lines of credit and credit cards—you may have one, two, or all of them. If so, when have you last checked to see if you have the best interest rates? Chances are that you probably either have not checked your interest rates in a long time, or have never done so because you may not know how. Continue reading to find out what you can do to get the best interest rates on your loans and/or credit cards.