PvE queues, on your mini-map one of the boxes. If you deselect the marks you don't want, you'll see the queues which offer the marks you do want, and some will be listed "Choice of Marks".
You can also get them from certain events like the Summer and Winter Events (Risian Birds and Winter Epohh breeding, if I remember correctly.).
"If you can't take a little bloody nose, maybe you ought to go back home and crawl under your bed. It's not safe out here. It's wondrous, with treasures to satiate desires both subtle and gross; but it's not for the timid." -- Q, TNG: "Q-Who?"
^Words that every player should keep in mind, especially whenever there's a problem with the game...
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(I'm wondering if there wasn't a battlezone I once got them from, too...hmm....)
^Words that every player should keep in mind, especially whenever there's a problem with the game...