After you get accepted, bring a jar to your local oral surgeon office and ask him to put in all the teeth he can. Store them in one of the above things, like diluted bleach, or sodium hydroxide, whatever, and get as many as you can.
You won't use them all, but the more you have, the better your chances of finding a good tooth to work on. We did some cavity preps, endo, etc. on the teeth we collected. The teeth are extracted, meaning they were pulled because they were decayed or unsavable. Sometimes a tooth is pulled because of econimics of the patient, and these teeth are pretty good to work on.