Cue in Gamma World-style "STOP" sign shields.Hammers they could get, but bats and pipes give more reach. Picks would be rarer- in a city, you'd have to get into a mountaineering store or a construction site of some sort.
Shields would have to be made unless you have access to riot gear...anyone want to raid a big city police station? If there are survivors, you risk getting shot. If there are none, you could get trapped, especially if you can't find the keys and set off alarms. *blaaat blaaat DINNER blaaat blaaat*
And maces? You'd definitely only find those lying around in certain museums.
And looking at that picture, a baseball bat with some nails driven through it would make quite the morningstar.