A Comic Worth Slabbing is Worth Locking: 7 Best Large Safes to Protect Comics In October 2023, a resident of Milwaukee, Wisconsin, inherited a copy of Amazing Fantasy #15. This rare 1962 comic book marks the first appearance of Spider-Man. With a CGC grade of 4.0, it could fetch around $35,000. In contrast, a near-pristine copy of the same issue sold for a staggering $3.6 million in 2021. If you’re serious about investing in the collectibles market, then investing in the best large safes to protect comics i ...