To figure out the value of your licorice stick, as clarinets are affectionately known, you have to answer several questions: What kind of clarinet is it? A piccolo clarinet, for example, is rare nowadays and worth more than say, the more modern soprano clarinet. What's it made of? Wood, plastic, or (every once in a while) brass. How old is it? As with anything, collectors usually want older intruments. When was the last time parts, most notably the pads, were replaced? Last but not least: Are there significant dents and scratches on it? Best way to get your clarinet appraised: Take it to a music store. You might have some luck on Ebay, but better I think to have an expert look at it.