Amazon offers Prime members the Bosch Daredevil 13-Piece Spade Drill Bit Set, model no. DSB5013P, for $14.49 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $6.42.) That's $6 under our mention from a week ago and the lowest total price we could find by $18. It includes 13 spade bits from 1/4" to 1-1/2".

Of note, it's temporarily out of stock, but it can be ordered at this price for delivery when available.