13Deals offers the Officially Licensed Comic Book Tin Sign in 15 character styles (Batman Retro pictured) for $9.99. Coupon code "COMICSIGNS" cuts it to $6.89. With free shipping, that's tied with our October mention as the lowest total price we've seen. (It's also a current price low in any style by $2, outside of the prices below.) Each sign measures 16" x 12.5".

A close price: PosterRevolution via Amazon offers the Hulk Sign and Wonder Woman Sign for $7 each or the Iron Man Sign and Amazing Fantasy Spiderman Sign for $7.41 each, all with free shipping.