Longmate Tools via Amazon has 21-Piece Longmate Professional Titanium HSS Twist Drill Bit Set on sale for $19.99 – 30% off when you clip the coupon on the product page – 50% off when you apply promo code 50GCMCKD at checkout = $3.99. Shipping is free w/ Prime or on orders $35+.
Note: Coupons are usually limited to one per account.