That is actually kind of funny. I've bought a set of cards which are different.
Casey: Joker
Leo: Queen of Spades, King of Clubs and Club Ace
Don: King of Spades, Spade Ace and Queen of Clubs
Raph: Queen of Hearts, King of Diamonds and Diamond Ace
Mike: King of Hearts, Queen of Diamonds and Heart Ace
Shredder: Jack of Spades and Clubs
Splinter: Jack of Hearts and Diamonds
I paid around 7 or 8 american dollars for them... Atleast if I calculated right