God of War fans can now preorder the upcoming 20th Anniversary Retrospective at Amazon. Published by Dark Horse, the two-book box set is filled with artwork and commentary on PlayStation’s popular action-adventure series. God of War: 20th Anniversary Retrospective releases July 8 for $100. Collectors will want to check out the luxurious Deluxe Edition, which is up for preorder for a roughly 10% discount discount at Amazon.