Hello, welcome to the forum. Are you saying you already have a set of the wacky Halloween postcards? That was the only set produced just for Halloween. In series 4 there were 3 bonus halloween cards but they weren't the large postcard size.
Thank you. I have:
1 card from 2009 that shows fright pie, botts and bricks
6 cards from 2010... Stake 5, Mike and Yikes, Boozooka, Mellow Cup, Kackel an one that has Star Beast and Toostie Troll.
So no earlier sets were made then? Great I don't have to play catch up!