If it is viable, buying in bulk is will always save you money. Instead of buying individual rolls of toilet paper, or paper towel, getting a box or set of them from Costco will bring the unit cost way down. Same with toothpaste, toothbrushes, soap, shampoo, and other toiletries. Same goes for food as well, although make sure you can actually get thru it by expiration date so you don’t end up just throwing things out. Although it may cost more in the short run, you will definitely save money in the long run.