I'd prefer it too, but there are still sneaky ones which make this hard. I try to avoid DCC altogether by using Amex, but then there are those times when the business doesn't accept Amex or their own branded card which gives bonus points isn't an Amex. My first successful DCC was express checkout at a hotel, without any warning, so I had no way to know until it hit my account. The second time, just recently, was a shop that similarly never mentioned any currency other than local and put the receipt in the bag. (I first saw the receipt when I was making some of my packing neater in the taxi on the way to the airport!) In both cases, I'd used Chase cards and they made sure I didn't carry the loss.