That really depends on the area you're in. There's no point in wasting the money on whips, chains and whistles if your customers prefer feathers, leathers, and dildos. You'd have to find a way to do a substantial demographic while being discreet. Even as open as we are here on Pixies there's still quite a bit of anonymity here.

Other than that I would say a wide variety of the usual toys, and probably a lot of custom made furniture. I prefer the look of wood. It's also easier to work with if you're the one building it.

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"BOY: On a hot summer night, would you offer your throat to the wolf with the red roses? GIRL: Will he offer me his mouth? BOY: Yes. GIRL: Will he offer me his teeth? BOY: Yes. GIRL: Will he offer me his jaws? BOY: Yes. GIRL: Will he offer me his hunger? BOY: Yes. GIRL: Again, will he offer me his hunger? BOY: Yes! GIRL: Yes. BOY: On a hot summer night, would you offer your throat to the wolf with the red roses? GIRL: Yes. BOY: I bet you say that to all the boys!" -Meatloaf