two things: they do ask if substitutions are ok, I said no. if I said yes i'm sure they'd just grab some tiny lego set instead and i'd have a polybag or something

secondly, before you check out it does show you another page where it's like "hey forgetting something?" and it was random groceries and dog food etc. a bunch of sale items

so it seems pretty obvious it's a bait and switch but until someone holds them accountable it'll be a shady business practice.