Worx via eBay offers its Worx 16-Piece Drill Bit Accessory Kit for $16.99 with free shipping. (Walmart charges a buck more.) That's $13 off and the lowest price we could find. It includes five driver bits and 11 drill bits in sizes ranging from 1/16" to 3/8".

Update: The price has increased at Worx via eBay; however, Walmart still offers it for $17.49. Opt for in-store pickup to avoid the $5.99 shipping charge.