Have you gone into a store recently and tried to sell regular US Blue Note CDs? I think you'll be lucky if they offer 50 cents to a dollar each. If you wanted store credit, you might get them up to $2, but even that might be lucky. Remember, many stores are selling sealed/new current Blue Note CDs for around $6-8. Used, they have to sell less than that which means they have to buy them for even less than that to make any money.
Kevin
be careful kevin - the "price police" might get pissed off!