Amazon has the Makita 26-Piece Impact Gold Steel Driver Bit Set for $9.97 with free shipping for Prime members or on $25+. Features mag boost, torsion bit holder, 2 double-ended, 2 magnetic nutsetters, 20 1" Insert bits.
Has excellent Amazon Reviews.
eBay has the WORX WX255L SD Semi-Automatic Power Screwdriver (Open Box) for $16 with free shipping. List price: $60. It includes a rapid reloadable cartridge that houses 6 common screw driving bits, making it easy to access and even easier to change.