Thanks for your post.
As long as the other seller(s) are offering the exact same product as represented on the detail page, they are allowed to add their offer.
If you believe a seller is listing against a detail page that does not exactly match the product offered, we ask that you report your concern using the following form: Contact Us
To facilitate an investigation, be sure you include the following information in your report, as applicable:
The ASIN/ISBN of the item's detail page and the product title.
The store or business name of the seller you are reporting.
A concise explanation of the violation.
Seller Performance may contact you through Performance Notifications to request additional information. (To review notifications, click the 'Performance' header, and then select the 'Performance Notifications' link.)
All reports are thoroughly investigated by our investigations team. For privacy reasons, the results of our investigations cannot be disclosed.