My bank set up a free sub-account with its own debit card that I use exclusively for online transactions. I keep a small amount of cash in it at any time, and

My bank set up a free sub-account with its own debit card that I use exclusively for online transactions. I keep a small amount of cash in it at any time, and then do an instant transfer from my main account as needed for larger purchases. If that CC# were to get hacked, it would be annoying but not catastrophic. Inconvenience level is pretty minimal and it’s served me pretty well.