Well, I went to Costco today and stocked up. Pretty much anything I saw that was what I use/eat, was a lower per-unit cost than my usual stores, and would be used/consumed while it was still good got added to the cart. Cleaning supplies, personal care items, soap, paper towels, various foods, etc. Nothing needing fridge/freezer space (besides the milk and bread, which was my usual quantity.) I actually stopped because I ran out of room in the cart. Didn't get a lot of perishable goods, and they don't have everything I use of course. I will be taking my mom on Tuesday so she can do the same, and might get a few more things if I see them and don't already have them.
I also ordered full cases of all the cat wet food I feed, and more litter. And told mom to do the same.
Will the prices on all this go up? Maybe, maybe not, but I was careful. There will be no waste, I have the storage, and now I can go shopping in my closet. The inventory is taped on the inside of my pantry door so its easy to reference, and I can take a picture of it before I go shopping. Worst case I just shifted the purchase early.