You don't need to buy that to stop.
The trick is to engage in a competing behavior. A competing behavior is a behavior you engage in that will not allow you to simultaneously engage in your target behavior (nail biting).
2 Suggestions:
-Wear thin gloves...not like ski gloves but any kind of glove you could tolerate to have on extensively until the habit goes away, or;
-Get someone to fidget with. Get anything...eraser, coin, pencil, fidget ring, pen...anything to keep your hands busy.
This is pretty much pulled straight out of my Behavior Modification class.
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