It does seem very tricky for a niche market like this since the value is probably strongly tied to the actual record, and then all of your other attributes are more like modifiers. Sometimes we do treat price as relative, like -10% below Average, Average, +10% above average, but I'm not sure if that is a great solution for you? Or maybe you could pair that with having some type of reference, like if a person says they like Rock and Roll, you could show them that album and the current price, then the conjoint could show the relative prices but actually do the math for them?