@stephenphelps , Stephen, your driver uses standard 1/4" Hex shank driver bit's, individual or bit kits can be found at any hardware or power tool shop, some times even at the dollar store. Posted a couple links you can order from. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
http://www.homedepot.com/b/Tools-Hardware-Power-Tool-Accessories-Drill-Bits-Driving-Bits/N-5yc1vZc267
http://www.harborfreight.com/catalogsearch/result?q=driver+bit+sets