You two are off to a great start.

I know how much fun it is to find and paint custom miniatures for a game.
I did this for my boardgames Forbidden Island and Clue.

I don't know anything about Arkham Horror.
But I've got these sinister spies.
The one on the top left I have painted as Reverend Green for Clue.
The other four are still looking for a job.
(The minis are unpainted, picture is from website Pulp Figures =set PHP 03).

You can let me know if they can fill a gap in your wishlist.