Lowe's takes up to 75% off a selection of clearance items during its Summer Savings Sale. Plus, MyLowe's members receive free shipping. (Not a member? It's free to sign up. Items over 150 lbs. incur additional surcharges. In-store pickup may also be available.) A couple of best bets:

DeWalt Tough Grip 70-Piece Screwdriver Bit Set for $13.98+ $0 s&h (pictured, $16 off)

Kobalt 76-Pack Gold Oxide Twist Drill Bit Set for $15.98 + pickup ($14 off)