Find cheap AAA/AA batteries but make sure to stock up on specials.
This is what I do on the rare occasions I get sent an offer worth considering. We don’t shop at woolies or coles for our weekly shop so look for specials when I go for an offer. We often have 50+ bottles of coconut water or 20+ boxes of breakfast cereal sitting in our spare room. All bought at half the regular price. MrsNoName commented the other day that we currently have more than 5 years supply of body wash after I bought about a dozen big bottles of it at half price to meet a bonus points offer about 9 months ago. No excuse for any of the NoName family to smell I suppose.