WTB or trade for Metal Slug stuff including 4 or 5 on MVS, 6 on Atomiswave, other stuff too

I know this is a long shot, but I’m willing to buy or trade. Basically, I want to finish out my collection of owning Metal Slug games on original hardware. I’d prefer to go through the community here for the assurance of not getting a bootleg - something that is very important to me.

Alternatively, although less of a priority, I’m willing to consider any other Metal Slug materials you may own - other releases, ports of games with artwork intact, posters, flyers, etc. This does not extend to figurines though, just promotional materials related to the games or the games themselves.