When looking for the cheapest service rates, new technology is worth looking into more often than not. Instead of just searching for low rates, try looking for new ways of getting that service first, then compare rates on those services.
Thanks to modern technology, elective utilities can be much less expensive than ever before. You might try voip service, or satellite tv rather than cable, both of which can save one a significant amount of loot each month.
Another way to pinch a penny is to keep an eye out for promotional offers and special incentives. People sometimes have a habit of thinking this is just another way to get you to "buy something". Maybe so, but is sure is nice to get that rebate a few weeks later.
Sometimes finding the cheapest service is a matter of taste. My grandfather for example wouldn't touch voip service with a ten foot pole for fear the "new fangled" monster might do him in. We all know this type, and pardon me if this is you :)
In closing, when sticking with traditional services, be sure to read the fine print. It isn't always the advertised rate that gets you. 0.02 cents a minute is great for long distance, but not if it's only that rate for 2 hours on Friday afternoon.
