The price of a kilogram of coffee is currently €5, so a family of four needs to buy three pounds of beans for €2.75.
That is a cost of €2,600 a year, but a family could save €2 a day on the coffee by buying in bulk at supermarkets.
Amazon, the online retailer, has also been selling a range of other goods, such as batteries, solar panels, and household goods, for about €3 a kilo.
Amazon is also making profits from its wholesale businesses.
These are the people who sell the goods, then get a commission.
The profits from the wholesale business are then reinvested in the company.
The company has been operating at around €10 billion ($14.5 billion) a year since its founding in 2000.
The profits are partly due to a strategy known as profit maximisation.
This means that Amazon is buying more and more of the same products, making it more profitable to buy them from suppliers, while cutting prices.
The firm has also recently introduced a new service called Amazon Prime.
It lets people book online, receive discounts, and get a free two-day delivery.
Amazon says it will soon increase the number of its European customers from about 80 million to over 200 million, with more than half of these customers in the UK.
This week, the company said that it would invest an extra €10 million in its Dublin offices, and would invest more than €50 million in new facilities in the north and south of Ireland.