I just saw that the craftsman 10 piece screw extractor sets are on sale for $8.98 with free in store pick up (normal price $17.99) Granted they are not the best extractors but still do a good job and worth having in the box.
http://www.sears.com/craftsman-10-p...pc-screw-extractor-set-w-vinyl/p-00966196000P
http://www.sears.com/craftsman-10-p...pc-screw-extractor-set-w-vinyl/p-00966196000P