I first found Broadway Paper when I was looking at various papers to create some invitations. The store is located on Broadway and Chicago down in the Third Ward.
Their selection is awesome, they have all types and sorts of papers, paper punches, cards, cardstock, ribbon, etc, etc. They also have a wide array of books to look through - either to order straight from them, or to get ideas to create your own.
Their prices are a bit higher than I was able to find on the internet, but then again seeing the real thing in front of you in the store is better than buying on the internet.