Take a trip to Etsy
Solaire of Astora and Black Iron Tarkus are two of the most memorable characters from Dark Souls, and although I love praising the sun, there's a special place in my heart for the latter (prepare to mute). We were graciously notified about the existence of two posters, one for Solaire and one for Tarkus, available over on Etsy.
The 24x36 posters are $39.95 each and have been "professionally printed with Fujicolor Crystal Archive paper and processed with vibrant laser chemical inks." I really like the color palette of the Tarkus print, though, again, I'm something of a fanboy.