You might want to check out department stores and VS or Frederick's. I've seen pasties at Wal-Mart, but it sounds like you're looking for something a little more substantial than that.
Just a little warning, if you buy pasties or anything that stays on by sticking to you, sweat will lessen the effectiveness of the glue/tape. So you might want to have someone who is going to be around you a lot carry some fashion tape with them just in case.
I hope you find what you're looking for!
Here are some ideas from VS:

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