Pushing credit card processing fees onto customers - How many of you folks do it?

Over the past year, half of my vendors have started pushing the 3 or 3.5% credit card fees onto us. Quite a number of places I buy from in my day-to-day life have also started charging cc fees.

I have always just stuffed the cost of credit cards fees into our budget / prices, as I am sure most of these vendors have as well. It's just one more way to cut costs or increase prices without saying that you are increasing prices.

Anyhow, how many of you folks are charging customers for credit card usage? How did your customers react, and what was your mindset for doing it?