Sulphuric acid is not available for store purchase in the EU. It's on both the explosive- and narcotics precursor list since a few years back. It can still be sold as a pool pH adjustment chemical in about 30% concentration, or in 17% concentration as a degreasing solution before metal painting. Or, you can salvage it from car batteries in a dirty, dilute form, usually riddled with lead impurities and in need of distilling to get it pure. This is however the safest way.