Here's what I found.
https://www.pixpress.com/e-store/uscarparts.asp
Seems it's pretty expensive for a system that isn't very user friendly. I think ditching the Pi and going with Aim, Stack or one of the other manufactures may be a better option. Newer systems incorporate GPS. No track side beacon to set up and forget at the track. Some OT groups frown on setting up beacons anyways.
I hate having a seperate page for each sensor.
I had a Stack 8100m with a predictive lap timer in my SRF. It was a much better piece then the Pi.