A couple fanatical French collectors have lots. As for true US TG prototypes, I haven't seen any except for the ones put up on eBay recently by a former VG&CE mag writer.I used to have a Parasol Stars proto for the PCE, but sold it quickly (it was identical or near- to the final version anyway). Nothing too special.I also used to have this: http://www.chrismcovell.com/TsushinBooster/ It was great fun.
Lol holding out on them I see. Don't forget about your Power Console proto.
I do recall a few years back someone had an Off the Wall proto, & I think they even showed a video of it.
making?
I also used to have this: http://www.chrismcovell.com/TsushinBooster/ It was great fun.