The old adage of “you get what you pay for” certainly applies to knife sharpeners as well. However, there is a wide variety of tolls that fall under that heading, and the prices vary as much as the items. A good sharpening stone can be had for as little as $20, but you can pay thousands for a professional sharpening system. But for most home use, expect to spend anywhere from $25 to $100 for a quality sharpener.