Waterproof notebook inquiry Germany

It is a waterproof notebook that is placed on the shower wall with two suction buttons. A similar products is called aquanotes and can be found on Amazon.

I would want a sentence added on top of each page.

The notebook comes with a pencil and the suction button for it.

Please inform me if it possible for you to produce the product and the costs for 500 and 1000pcs.