I actually have a lot of the stuff you're looking for. Here's a tip for you right now: DO NOT pay for any of that stuff. Paying for a bootleg is the last thing you should do. You can always get it for free.

DAYV, don't worry about that VHS. Here's what I have from the intially posted list:

The Fantastic Four (1994) (unreleased)
Captain America (1991)
Generation X (1996) - transferred from UK home video release, includes a few lines of dialogue cut in the US TV airing
Justice League of America (1997)
Nick Fury: Agent of S.H.I.E.L.D. - also transferred from UK home video release

Email me at reverendbeastly AT gmail DOT com with a trade list. Or, if you don't have anything else to trade, send me blanks and return postage. But we'll work something out.