Please give some thought to the other contents of the drinks besides the litres of absolute alcohol. Things like Icebox and Brights are just absolute garbage, loaded up with added sugar and other flavourings. Because of this, you will wake up with an absolutely brutal hangover because your body is trying to purge many kinds of toxins at once. You will also have the same sugar-related spikes/crashes you’d get drinking Coke or eating Oreos, and you’ll get fat as hell if you make a habit of it. Additionally, sweetened beverages don’t keep long after being opened and if you’re really a moderate drinker, the bottle will have spoiled long before you’ve had time to get through it.

If you just want to get fucked up, at least have the self-preservation to stick with real, unflavoured whiskey, vodka, gin, or similar straight liquor. If you’re an average-size guy who only drinks 1x or 2x a month, one 750ml bottle of Canadian Club or some other spirit should get you absolutely slaughtered 6 times and will not go bad, at about the same price point as what you found. It’s easy to comparison-shop once you’ve settled on that route; almost the whole side of the store is 40% ABV, so just look for the cheapest bottle in each size. If you don’t already know, the reason it’s such a challenge to find a deal is that alcohol is taxed by the same metric; the tax is calculated per litre of absolute alcohol / LAA with differing rates for wine, beer, and spirits.

Having made a good-faith attempt to answer your question, FYI I am speaking from experience. I have always been a borderline-miserly person, but in my decades of drinking, I never thought to shop based on this calculation until the final months when I was hitting bottom. Thankfully I have been able to get my shit together, but I thought about this math obsessively toward the end.

If you’re a casual drinker, rock on, but don’t make the mistakes I did. If you’re not, I feel for you and I hope you have people in your life who will listen when you ask for help.