Daily deal. eBay (Black and Decker) (99% positive feedback) have the manufacturer refurbished Black & Decker 7.2V Refurb Drill Sale Priced for $15.99 with Free Shipping. Tax in most states. Sells for $30 at Amazon new. This has a 2 year warranty.

While this is only 7.2 volts, the upside is it's lighter than those more powerful 12V or 18V models. More comfortable if you're standing on a ladder leaning over to drill something or drive screws. Note: the lithium-ion battery is built in and not removable.