The equivalent of a double stick is usually around 2,14 Euros here. The price of butter practically doubled overnight in 2017. These are the butter prices now, and you used to get a slab of butter for under one Euro. See pic and article.

https://web.archive.org/web/20171013043102/https://www.cnbc.com/2017/08/07/butter-prices-spark-major-crisis-in-europe--with-costs-for-cakes-and-pastries-expected-to-skyrocket.html