I use a dremel. Actually, it's a Black and Decker "rotary tool."
I begin my cut just underneath the flip, and saw down about halfway deep into the plastic, from one end of the slab to the other. Then, I just insert a flat-head screwdriver into the gap, pry upward, and the whole top half of the flip pops right off.
The whole thing takes about fifteen seconds, and no sharp instruments ever get near the card. It works with all slabs, although the Beckett slab is a little tougher to cut through because it's made from space-age polymer.
WEAR EYE PROTECTION. Eventually the blade weakens and breaks (I use the disposable, round, sandpaper blades), and goes flying across the room.
-Al
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