Well, at my post office, it depends upon the person behind the counter and whether they're in a grouchy mood or not! and then it could change at a neighboring town's P.O. Caveat emptor! Our guild had experience with those quilted postcards we did a few years back... everything from the regular postcard rate to over .80 for either hand stamping and/or thicker than 1/4 inch! WHAT-EVAH!