My FI really likes the idea of doing a postcard since most of are family and friends will be coming from OOT. I'm open and like the idea, especially if they are cheaper. Anyone have any advice or experience doing postcards? They seem to be cheaper online, but then I asked myself the question of envelopes? I know that defeats the purpose of a postcard but is it tacky if you do or don't? Guess it doesn't really matter in the end but any advice is welcome!