Where can I get a Hershey Baking Bar from?

Ok so I saw this Tosh.0 and Im trying to host a competition at school. I just don't know where to get a Hershey 100% Baking Bar from. If you can just name any local chain stored that would be cool. I really don't want to Order online so please just start naming. Or if you can contribute a good school appropriate competition that would help too. What we are looking for is like a nasty non-lethal dare. Kind of like that show Fear Factor. Thanks For any Contributions.