The Superior Spider-Man [Campbell] #20 price

The Superior Spider-Man series shows a significant difference in value depending on the issue number. Issue #1 (if it were listed) would likely be the most valuable, but based on the items you have: Issue #20 is the most valuable at a used price of $627.90 [1]. The value drops off considerably for the later issues, with Issue #22 at $60.99 [2] and Issue #29 at $28.99 [3]. Issue #31 is the least valuable of this group at $4.84 used [4].