After a thorough research - I'm sorry to tell you that all the brands you named are considered high-end brand names are not available even through wholesale and certainly not as dropshipped products.
Rolex, Piaget, Breitling and Patek have their own network of authorized dealers, retailers and distributors for their products. One may reason for the limited distribution is to help protect the products' authenticity and quality.
If you have other products you need help location suppliers for please let us know.
All the best!