Milk costs me £1.10 / 4 pints. So that's $2.36/US gallon (why 6.6614 pints in a gallon, why not a round number??? Edit: US pints are different and smaller. 8 US pints in a US gallon)

That seems to compare favourably with US prices. https://www.walmart.com/ip/Great-Value-2-Reduced-Fat-Milk-1-...

That's for grass fed cows that are free to roam outside.