Things have changed. Bulgaria isn’t especially cheap anymore but Italy is.
A 0.5l can of Co-op home brand beer is 60 Euro cents in Switzerland of all places. Germany the same. Put in the motorhome fridge for an hour and it tastes like any other lager.
Bourbon, the ubiquitous Western Gold brand that Lidl and Aldi sell was typically 13 Euro for a 70cl bottle but only 8 Euro in Lidl stores in Italy.
Turkey, unsurprisingly was very expensive for alcohol but not just because it’s mostly non drinking, also because of raging inflammation.
So for cheap Euro booze stock up in Italy.