Nespresso® suitable capsule EMPTY made of stainless steel to refill yourself. Mix your favorite coffee yourself. You need 7-8 grams of coffee for one coffee. Do the math yourself:
 500g coffee, let's not take the cheapest, cost about 8.-
 This means that you can make approx. 65 coffees with 500g of ground coffee.
 8.- divided by 65 coffees = 12 cents per coffee.