Strange, geeky questions for the intartubes

[elfs]

I can't sleep, so I'm up late bothering you with strange questions. First, I'm wondering if there's such a thing as a cheap pressure or touch sensor, relatively flat, that has a predictable curve of output the more it's squeezed between your fingers. I'm thinking of something flat and maybe the size of a quarter, it has to be cheap (preferably less than $5 each), it can't have binary output, and it shouldn't deform very much when in use. There's gotta be something like that; isn't that how electronic scales work? (Maybe I should just go to the Salvation Army, buy one, and take it apart.)

Secondly (and you can wonder about this all you want), how do you go about buying Fleshlights wholesale?