CheckPermission provides Amazon sellers with an instant, on-page notification indicating whether or not they are authorized to sell any physical Amazon product, including books. It also indicates 'Hazmat' status.
CheckPermission Bulk is also available. It checks thousands of items at once for seller permissions, and includes the regular CheckPermission at no extra charge.
$9.99 per month or $79 annually (3 day free trial).
CheckPermission Bulk is $47 per month or $279 annually (no free trial).