Definitely not a hot deal. Anyway, if you aren't going to need a continuous supply, go to a small computer shop and ask for some and they will just about always give you some for free. If you must buy them, cyberguys has some fairly cheap. Hardware stores are also great a great source for screws. You might have to cut them but you should be able to find some in the proper diameter and pitch.
In search of rather than announcing, seemed the most applicable. If you'd like to recommend a better category it would be helpful.
Cyberguys.com is one I hadn't seen before and they are much better than what I'm used to seeing (24 for $1 instead of starting at $0.50 per screw). Thanks!