You know those toilets that run and run until you jiggle the handle a little bit? Well, there are usually only a couple of things wrong in that case and neither should cost you more than five bucks to fix. The easiest scenario is that your toilet handle is sticking. This is all just a matter of spraying a little lubricant where the handle meets the porcelain. The other option is perhaps a flap valve in the toilet tank that needs replacing. This is something that shouldn't cost more than $5, and even a novice DIYer should be able to do it. Before you call the plumber, who will probably charge you a hundred bucks just to pull into your driveway, see if you can fix that running toilet yourself.