My sister and I were comparing some of our bills since we were both trying to cut back on the amount of money we were putting out each month. The first several bills were pretty similar, since we both had the same cable and mobile phone provider. Actually, it was not until we got to our car insurance bills that we finally had our first major discrepancy over what we were both paying. She had the cheapest auto insurance compared to what I was paying every month.
Granted, she was paying hers on an annual basis while I paid mine on a monthly basis. I understood that I would pay slightly more because of this, but she was still paying a lot less even if I switched to an annual plan.