The Parallax 28155 Basic Analog and Digital Parts Kit and Text: A/D and D/A conversion make it possible for a digital device, like the BASIC Stamp 2, to both measure and control "real world" values such as voltage, light level, and frequency.
Price: US$49.95
The Parallax 28158 HomeWork Board Project Platform 10 Pack is a solution for Educators combining the Board of Education and BASIC Stamp 2 microcontroller for less.
Price: US$449.00
With the Parallax 28176 Process Control Parts and Text you can build your own A/D converter, light sensor, tachometer, and incubator control systems.
Price: US$49.95
The Parallax 28803 Board of Education USB Full Kit contains a Board of Education carrier board, BASIC Stamp 2 module, pluggable wires, and USB cable.
Price: US$99.95