Any place that volunteers to give you change for the bus without a purchase is great in my book. While they can't compete with the big office supply chains inventory, they are a neighborhood fixture and always there when I need basic office supplies - with prices that seem comparable - and sometimes less - than the big guys. Plus, it feels good to buy office supplies in the neighborhood.
Pros: they are local and not a national chain
Cons: variety and selection is a bit limited