Costco’s home page structure is broad web. The home page major focal point is the categorical product modules. Those modules have subpages that may or may not link together.
Lowe’s uses five broad department categories for global navigation. This may require the user to navigate to deeper levels than Costco's home page.
Home Depot made search a focal point with categories being an accessory to the search bar.
Considering all of the above, this sketch is a Costco home page design concept. The design aims to be intuitive and free from noise and option clutter.
