I was trying to search for it but didn't find a thread about it. (redirect me to the right post if there is one).
You can find here
https://www.amazon.com/gp/pantry/info/pantrypromotion/ items that save you $5 when you buy 5, $10 for 10 and $15 for 15 items.
Available for prime members only.
The cheapest the item the more saving you will make.
Personally, I use it for the Earth's Best cereal
https://www.amazon.com/dp/B000VK11RK/?tag=cl03f-20&psc=1&smid=ATVPDKIKX0DER. They are cheaper than everywhere else ($2.94). 11 in my cart for comes out to $2.58 each with free shipping.
Post here your deals.
Can it work with other offers and promotion codes?