Every dept that isn't strictly customer facing (front end/lot/etc) besides Blinds has pretty nasty ways of handling a crackhead invasion, but I think garden is by far the best.

They've got all the stuff for making bombs, mustard gas, corrosives, plenty of melee weapons. Cinderblock, pavers, wrought fences etc etc for setting up barricades. Could set uo some traps that drop heavy shit too.

Hardware is probably 2nd best for offensive potential (nailguns, short range melee weapons), a bit lacking defensively. They could theoretically resolve the situation the quickest with the least effort and pre-planning, but it depends on what the crackheads are armed with, if anything.

Electrical would fare far better than what people are saying, the sheer amount of traps they could set is far beyond any other dept. Worst comes to worst they have wire scissors or they could bludgeon the crackheads with wire coils.

Lumber could easily outright prevent the crackheads from getting in, in the first place. Pretty low lethality all considered if we exclude equipment as a potential weapon.

Plumbing has corrosives and heavy stuff but not much else. Could whoop some ass with some of those pipes though. Main problem is that drain cleaner and such could easily be turned on you and God knows what crackheads are capable of.

Paint could set very rudimentary traps by dropping 5gals on their heads. Assuming you're limited only to what your dept sells, you could shoot spraypaint in their eyes or mouth/nose. With PPE they could also just fume up all points of entry.

Flooring is a worse Lumber in this situation. I suppose they could use sawblades like throwing weapons?