I’ll tell you a secret, look at ATB, they sell the cheapest alcohol there, as I heard they stir up something during customs clearance and excise taxes, the prices there are lower than in other supermarkets. But if you really want to save money, there are shops that stir up something with excise duty and they the prices do not differ much from the dutik, I know one on Moscow Square, a semicircular house of science 4 (like), there is a shop where alcohol is sold cheaper than supermarkets, on the DR I took a decent whiskey for 340 UAH 0.7 l several bottles, as well as rum-cognac - vodka absolute, etc. I think there are a lot of such shops in Kiev.
there are no people who want to provide a service, but banter .... well, a forum ....