Size: 1/2" (12.5mm) diameter active area by 0.02" thick (Interlink does have some that are as large as 1.5"x1.5")
Price: $7.00 from the Adafruit shop
Resistance range: # Infinite/open circuit (no pressure), 100K ohms (light pressure) to 200 ohms (max. pressure)
Force range: Force range: 0 to 20 lb. (0 to 100 Newtons) applied evenly over the 0.125 sq in surface area
Power supply: Any! Uses less than 1mA of current (depends on any pullup/down resistors used and supply voltage)
Datasheet (note there are some mathematical inconsistencies in here)