These are made by the USPCC for Ellusionist - a sort of commission which the USPCC will gladly do if you order enough decks. Take a look at their web site.
Ellusionist then sell onto other stockists - or they order in bulk from Ellusionist as an individual rather than a dealer. Anyway, there are plenty of stockists of Tigers and Ghosts around if you look around the magic dealers.
Ellusionst will not get a few bridge sized decks for you as they don't make them and the mainstream market prefer Poker sized anyway. However, you can't go to the USPCC as they will be copyrighted by Ellusionist as their own design (most probably).
Therefore, by default you won't get any other than standard Poker sized Tigers and Ghosts!

Member of the Magic Circle & The 2009 British Isles Close-Up Magician of the Year
It's not really an optical illusion - it just looks like one!