L & M Mini Market & Gas

I stop to get gas here all the time and pay with my debit/​credit card. They have no machine so I have to give my card to the cashier and go back outside to pump my gas, go back in and retrieve my card. This normally isn’t a problem. My friend also gets gas here and does the same routine with his debit/​credit card.
Yesterday, I discovered by debit/​credit card had been used for several hundred dollars in Canada. I called my friend, lamenting about how ironic it was that this happened as I had just returned from the east coast on business and how I thought someone in the airport must have stolen my number. He checked his account, out of general paranoia and discovered that he, too, had a pending (fraudulent) charge at a store in Canada for just shy of $ 100. What are the odds that we get gas at the same location, and both of our credit card numbers were stolen? We checked our records and he got gas at this location on the 12^th, I got gas on the 15^th, both numbers stolen and used fraudulently.
Coincidence? I think not.