You have a musical instrument that you know is worth more than nothing. Guitar, keyboard, bass, mixer, rack-mount gear, guitar amplifier, recording console. Do not do drums, violins, or wind instruments. I will do a one page written value. My valuation is based on being a studio owner, professional musician, and professional gear broker for the past ten years. I have brokered everything from $100 microphones to $10,000 plus vintage guitars. I also do price comparisons on ebay, but I DO NOT just simply base a price on ebay. You should never base the value of gear just off of ebay. I have done music gear transactions with everyone from Nashville Studio owners to synthesizer manufacturers to the guy down the street. It's worth it to have your price backed up by a professional.