Deep down in the Financial District is Chameleon Comics. They've been here for years and managed to survive the events of 9/11 when so many other local business's were forced under. They carry a decent selection of new comics but have very little by the way of back issues. If you want to read the new comics you can pick up whatever is recent and work your way through it. If you want something a little older its time to hop the subway and head uptown.