When I have access , i put my pelican coolers in my buddies big deepfreeze for a few days prior to camping. Couple 2 liters of frozen water and good to go. Cover the cooler with the sleeping bag and it stays FROSTY cold
Not sure if it's all tractor supply stores or just the ones by me, but they have treeline coolers on sale in store. Seem comparable to the big name brands for a lot less. The quality seems nice as well. https://www.tractorsupply.com/tsc/product/treeline-premium-cooler-45-qt-2811s752g
