Collecting anything is never easy. Over the years collecting Star Wars items, I've spent a long time tracking down items and finally obtaining them, and the same for video games. When I was collecting all known PSX RPGs some of them were really hard to find and the prices varied a lot. It is definitely worth doing your homework and seeing exactly how rare something is as sellers can just be unrealistic and think their items for sale are worth more that they really are.

And I've also lost items in the post which is worse than not finding them for sale in the first place. One game I purchased from America never arrived and I had been searching for that for months. I did eventually find another copy but it was annoying, and it wasn't cheap either.

BTW, I have originals of all of the games you listed, and may have a duplicate of one of two of them. I will check and if I do then I would gladly sell them to you.