Dont forget the FinalGROM99
https://endlos99.github.io/finalgrom99/
I am in the UK and Ti99 stuff is pretty rare here. The home computer market was so cut throat in the 80's that there was very little apart from Cartridges and Cassettes sold. The original cost of a PEB was so high in the UK i dont think there were many sold or now survive. My next upgrades are likely to be new 32K and TiPi sidecars. When they are available.. i hope