FYI
There is a 24hr hardware store at 202 East 29th Street between 2nd and 3rd. It has about four floors. This place has everything you could possibly need. You don't know how many times I've had to visit this place while working overnights, to bail us out of some jams.
and as far as a 24hr Walmart, trust me its not as well stocked as people think. We have one in town and I rarely go there because the lack of selection on all items has become very weak. If they decide they are going to sell Honey Nut Cheerios then that's the only cheerios your likely to find. Good Luck if you want Banana Cheerios.
Steven