Update: The promo code is working now, if you weren’t able to get this a few days ago.
There are a couple different DIY fixes (toothpicks, rubber bands, etc) to remove stripped or damaged screws, but if you don’t have the time or patience to try those out, consider grabbing this $7 Dr. Meter kit. It includes four bits that fit into most drills, and grips onto screws making them easier to remove. Just be sure to enter MWIA5Z4J at checkout.