Are you coding this yourself or looking for a pre-made solution?
I think the best way to keep track of it would be adding a new member feild to the database to store this cd id. When a member buys the cd you update the cd id to the correct number.
This would only work if registered members are the only group allowed to buy cd's. If you wanted to you could store the cd id's in a table with a email, then match the email to one in the vBulletin member database.
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