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AnonymousGenerally I post raw cards in a top loader, then 3mm foamcore board on either side (taped together), then place it into a bubble envelope. Some of my feedback has noted "well packed" which is pretty good I guess 
The ones I hate are when you buy multiple cards and some sellers cram so many of them into a single top loader in order to save themselves a few cents. I've had cards which I could hardly get out of the top loader, so it amazes me how they got in there !
I've also received cards dropped into the envelope inside a folded up in a piece of A4 photocopy paper (as in three folds like a letter). Obviously some people think that the mail is sorted carefully by hand, and laid perfectly flat...