Snaz75.com is selling what has to be considered the ultimate stripper shoe. These things have a clear sole with a small slot in it that allows the customers to put their tip right into the shoe. In addition to it just saying 'tips' near the opening in the shoe, they also have versions with lips and neon green dollar signs.

I'm sure they didn't intend it, but they've actually invented a perfect solution for anybody wanting to tip using Sacagawea dollars.