There are many methods to doing this.
I don't cheat in poker or do demonstrations of actual skill (I do the occasional poker demo, but never utilizing actual moves).
Erdnase is one of the better places to learn stacks, culls, and other tricks (bottoms, palms, seconds...)
Expert Card Technique has plenty of moves that can be adapted for the card table, Foundations by Jason England might have something to say about this as well.
I would say riffle culling and mucking cards (into your lap) would be two solid ways to find and stack cards.
I say all of this with caution, because I'm not an expert on such techniques.