Depends on what you’re buying.
GirlChild (like most kids I suspect) is obsessed with little crap plastic toys in blind boxes. You can buy them at a toy store or gamestop etc… for ~$5 ea or you can get them at the dollar store for ~$1-2 ea.
Recently it’s been packs of little micro lego animals (Chibimals? who can remember the names…).
But yeah, the staples like toothpaste and whatnot are much more expensive at the dollar store.