This is the page for "Take Home" samples. The model # for this product is #PF9364. There are 20 square feet per carton. For 1200 square feet, including 10% for waste and culling, you would need 66 cartons. https://www.homedepot.com/p/Millstead-Vintage-Maple-Natural-3-8-in-x-4-1-4-in-Wide-x-Random-Length-Engineered-Click-Real-Hardwood-Flooring-20-sq-ft-case-PF9364/202034714
This is the page for sample pieces only. The flooring is model #PF9686. There are 33 s/f per carton. Allowing for waste, you would need to order 13 cartons.