Whenever I've bought some I've found a shelf stacker and asked if they had any stock. Often they have stock but don't put it out as folks fill their cart then use the self service tills which don't enforce the 3 bottles per person limit.
This will have passed anyone over the age of 25 by completely.
A little background: there is a hugely popular YouTube channel called The Sidemen. A bunch of blokes in early to mid 20s that make videos of themselves doing challenges and tasks. They’re all doing very well from it. One of them...