A gallon of milk is $3.45 ..

$3.45 USD are $4.35 CAD. The cheapest gallon of milk at Walmart in Canada is from Sealtest at $4.69 CAD a gallon. Not even a 10% difference.

https://www.walmart.ca/en/ip/sealtest-partly-skimmed-2-milk/6000199044831

Bud light $18 in America for 24

$18 USD are $23 CAD. And maybe don't by Bud Light. You can get a 24 pack of Brewhouse Pilsner for $35.

Alcohol is more expensive, but only by about 20%. Johnnie Walker Red Label is $22 USD at Walmart, which is $28 CAD.

https://www.walmart.com/ip/Johnnie-Walker-Red-Label-Blended-Scotch-Whisky-750-mL-80-Proof/12167199

Here is Saskatoon you would only pay $6 bucks more for it.

https://www.saskliquor.com/spirits/m1659873/diageo-canada-johnnie-walker-red-label-750ml/

So tell me how milk is three times more expensive when you pay $4.35 in the US and $4.69 in Canada?

Or how alcohol is three times more expensive when a bottle of Johnnie Walker costs $28 in the US and $34 in Canada.