To commemorate 75 years of the Gotham City Dark Knight, the United States Postal Service has released a series of Batman Forever stamps. That’s ‘forever’ as in the type of stamp and not the horrendous 3rd movie with George Clooney. The stamps feature eight unique designs in a sheet of 20 stamps. You’ll get four different versions of Batman (one for each of his four eras in publication) and four versions of the Bat-Signal. $9.80 per sheet.