One per customer. Weird deal though, the conditions say you have to be "invited through social media..." Must be a cookie or something, doesn't work every time, I had to empty my cart and restart at Amazon's home screen a few times before the "enter code" box appeared at checkout. Code is SMART5, see https://www.amazon.com/gp/product/B01MZEEFNX/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1
Not that these are the most useful things anyway, only good for dumb appliances, a lamp or coffee maker. But who among us can resist a good deal?