What tool do I need to sharpen a nice pocket knife on a regular basis? Where can I buy said tool?

how good are you at sharpening and how sharp do you want it? Wal-mart has a bunch of self sharpeners that you just run the blade through, spyderco makes an awesome ceramic sharpener that presets the angles so you just run the knife down them, comes with easy instructions and is usually sold at sports/knife/recreational stores. also if you spend a little extra and get a good blade (IE high carbon or good steel) it will take less sharpening.