piezoresistive force sensor

Hey there,

I am looking to interface arduino with a pressure sensor, but I am not sure which one to use.
My goal is to incorporate a 2 or 3 pressure sensors into a carpet. When someone stands on a sensor, a sound generated depending on the sensor activated.

Which pressure sensor/online vendor would you recommend for that?
For local vendors, I am located in San Francisco, CA.

Look for a pressure mat the sort you find in security shops as suppliers, the sort used in burger alarms.
Sorry I am not local to you so don't know any suppliers.