If they are all going to the same location, by the time you put them in Card Savers or Top Loaders, you will be closing in on 13 ounces. That is the MAX you can ship via First Class.
I would wrap them in cardboard or bubble wrap or both, and fit them into a Flat Rate Small Priority Box. Should cost ~$5 or ~$6. Or stuff THAT into a Flat Rate Priority Envelope which will save you 50 cents or so.
Good Luck!
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