Drain snake. This is a simple, shorter version of the big gas-powered snake that plumbers use to clear clogs deep in your drains. But if the clog is not so deep, owning one of these can save you a good bit of money. They come in different lengths and you can buy powered versions, but a simple 25' snake with a hand-powered crank will set you back less than $25.
The word "plumber" dates from the Roman Empire. The Latin for lead is plumbum. Roman roofs used lead in conduits and drain pipes and some were also covered with lead, lead was also used for piping and for making baths. In medieval times anyone who worked with lead was referred to as a plumber as can be seen from an extract of workmen fixing a roof in Westminster Palace and were referred to as plumbers "To Gilbert de Westminster, plumber, working about the roof of the pantry of the little hall, covering it with lead, and about various defects in the roof of the little hall". Thus a person with expertise in working with lead was first known as a Plumbarius which was later shortened to plumber.