We've had our debit card skimmed twice. Both times we used the same corner store and the same gas station that day. I never did find out which place it was.
The card that was skimmed is for an account that doesn't hold too much. We transfer weekly money into it and use it for groceries and gas etc and leave the rest in another account. So the thieves weren't able to get much and it was returned within a few weeks I think. I do remember there were signs up at the banks in town alerting customers because we live in a small town and it had happened to just a TON of people. We all use the same few stores, gas pumps etc so it was easy to get everyone.