There are many niche websites selling many different products that fit their niche. Here are two examples.
Here is one that covers lifestyle living:
Molly Sims: Everyday Chic This page features a number of product categories. It is well worth visiting for ideas and is an excellent example of a site optimized for selling.
The Home Page www.mollysims.com simply features more shopping opportunities.
Blog heading has the following drop down menu:
And each of the above is simply a sales page.
Books heading has two drop downs: a sales page for each of her books.
And here is another outstanding product related selling site [this one medical]:
Mayo Clinic GeneGuide™ is a genetic testing experience that helps you understand how genetics can affect your health. Get personalized insights, interactive tools and education that help you explore the health information in your DNA, carrier screening, disease risk, family health history and more.
$179.99Price includes $25.00 collected for an independent physician to review and determine whether the test is appropriate for you, and for genetic counseling services.To use this product, you must be 18 or older and be a U.S. resident. Not available for residents of Maryland, New Jersey, New York, Pennsylvania, or Rhode Island.
Includes a DNA kit for first-time users.