Upgrade kits were always sold to consumer. This has been posted before. The PS-2 3V upgrade kit at $180 MSRP and $150 Club was the best thing going. If you sent an engine to MTH for repair, excluding labor, the replacement cost of the parts was $200 boards and $34 for the steam hardware kit. So $234 in parts alone.
The PS-3 will be more expensive based on the note (estimate $20 to $25, but the official price has not been posted yet. G