IF you are "marking" them for shows, many of us have used some sort of case for 10-20 pens at a time and have one price for that group. Then, there is no "tag" hanging off each pen (no matter HOW you put a tag on a pen, it detracts from the pen). You can have 3 or 4 price points, or a dozen or more, depending on how many styles you have turned, and are ready for the show.
If you don't have a lot of pens, make price "tents" (4 x 4" piece of paper folded in half) and have the tents close to the pen(s) that come in at that price point.