My Brickseek show two nearby Walmart with Weber Cubes one dollar per box. It also shows unknown quantity. I'm not going to get out of my easy chair to go Walmarting, but if I had a reason to be there, I'd look. Been using Rutland Squares a couple years now with occasional Tumbleweed sales and torch.
https://brickseek.com/walmart-inventory-checker/?sku=21943440
https://brickseek.com/walmart-inventory-checker/?sku=21943440