Adventurer issues that would have gone with releases of games, anything could be of interest
Promotional/merchandise interesting items (f.e. S&M pen, pin badges, keychains/EfMI mug/FT Corley keychain/other)
Hint books outside of the above might be of interest
Trying to collect all the physical representations of objects from within the Monkey Island games as I can! Got the TMI Deluxe Edition box set, MI2 SE voodoo doll, and TMI voodoo card set, but I am still looking for the SMI SE T-shirt!