Yes, the ArduinoTrack board can be purchased as a bare PCB, a kit, an assembled kit, or an assembled kit with the optional HX-1 300mW transmitter module. All of these can be purchased from the Custom Digital Services, LLC website.
Not understanding how the ptFlex or ArduinoTrack flight controllers work, or can help you track your balloon? Here are some of the most frequently asked questions.
Yes, both the hardware and the firmware for the ArduinoTrack has been released under the GPL open source licensing, and is freely available on a GitHub repository for your specific purposes.