You seem to have got your own opinion confused with fact. An IBA white Russian has different quantities:
1 Shot Russian Standard Vodka
1 Shot Disaronno Amaretto
1 Shot Kahlua
1 Shot Baileys
1 Shot Milk
1 Shot Cream
thats the point. I DONT do as i please, its 2vodka,1 kahlua and 1 cream = proper IBA cocktail white russian, full stop.
if you like it like that its completely fine, but you should know how its done and make sure you type what the modification is...

In the supermarket, I know Tesco stock it
Little tip to add, don't use crap, cheap vodka. It ruins anything vodka-based which is meant to taste good. Smirnoff at the very least!
