Typically, a book of 100 stamps is called a roll of stamps. A roll of 100 stamps will cost you $58.00. Again, you do not save any money by buying in bulk. A single first-class stamp or Forever stamp will cost you $0.58. Since you get 100 of them in a roll, the cost will be $58.00. If you purchase these stamps at a retailer other than the post office, the price may vary slightly. This is especially true if you are buying rare or collectible stamps.