20% off if you buy Three or more Brainwavz

Amazon is running a promotion that gets you a 20% off discount in the shopping cart when you purchase three or more eligible Brainwavz products, or 10% off if you purchase one of them. All the eligible items have this promotion mentioned on their individual product page:

brainwavz_20off_when_buy_more

Once you add enough items to the shopping cart, the discount gets automatically calculated on the top right side of the Checkout page. You don’t have to enter a coupon code. What you see below is with three Brainwavz HM9s: (you don’t have to buy three of the same, I just did it for simplicity and easy math):

brainwavz_20off_when_buy_more2

These are the Terms of this limited time promotion. An expiration date is not mentioned there but it won’t last forever.