@mitchellDid you win any free cards?
No. Currently I have all cards except two SECs, so I can't win any free cards.
If there were any available cards in the store, I probably wouldn't be playing this game. I don't like the fact that when I buy a scratch card for 10 credits, I win a card that is worth 8.8 credits. This is not a win - I'm losing 1.2 credits this way.
That's why some time ago I bought all cards using progressive packs, saving around 38-40% in average. This increased my chances of getting back more credits from purchased scratch cards.