The Menards stores in my area have been getting rid of various bits of useful hardware. I got 100 #4x1" sheet metal screws for a quarter, about
50 lock washers for around $.50, and a few other things.
If you're in the store (it's certainly not worth a trip just for this), it's worth the 5 minutes to take a look.
One other tip: Woodcraft had DeWalt #2 Phillips bits for $2 for 25. These are great for drywall/general purpose Phillips screws (if you use that kind of screw). They work pretty well for many other Phillips screws as well.
Puckdropper