Search around. I'm not sure on prices, but I know PSI sells similar laptops. Depending on what you need, you may also want the adapter card and LON cables to be able to work on the LON system on tac 20s. Vertical express also sells the orange DMC cable if you don't purchase one with your laptop. The big A has unlocked (unlimited use) blue tools that work for Otis stuff for roughly 75 bucks.