So I'm nearing a complete mint collection of pal games, I've decided I want to go the whole hog and go for U.S and Japanese collections as well.

Thing is I know the pal market like the back of my hand... average prices, availability, rarity, but I have no clue on the other ones, so perhaps someone could give me a rough idea in comparison to the PAL region, how much harder (or easier) these 2 markets will be to collect, bare in mind I'm based in the U.K

Any advice is much appreciated :)