This deal has ended.
Update: the price has jumped to $20.92! Amazon has this 21-Piece DeWalt Screwdriving Bit Set (model DW2161-SD) on sale for only $11.99. The set includes 21 bits, a replaceable-head screwdriver, and a translucent case. Shipping is free with a $25 purchase and there is no sales tax (except KS, ND, WA).