A $10 here and there, but never enough to bring too much suspicion. And then I'd go to the store and buy a few packs of cards to cover for the 3-4 packs I had in my pockets. I was probably 12 or 13 when I did this. The first time I was sweating bullets but it got much easier after a while.
Luckily my life of crime ended in high school after I got a job.