Advocate II
I've got several friends that use the Ozark Trails coolers and seen allot of reviews that show them lasting as long as the Yeti in all their tests... They appear to be the best bang for buck, especially if this is going to be an intermediate step to a fridge. Most of the stores have them in stock too.
https://www.walmart.com/ip/Ozark-Trail-73-Quart-High-Performance-Cooler-Grey/49229408
https://www.walmart.com/ip/Ozark-Trail-73-Quart-High-Performance-Cooler-Grey/49229408