Let's see:
1) IGC Flight recorders are expensive because the market is small
2) No manufacturer is making any profit, some have left the business
(and their customers)
3) The market is almost saturated
4) If COTS receivers are accepted, half (or more) of the shrinking
market evaporates

Guess what will happen to the price of IGC approved flight recorders.

Beware of the law of unintended consequences.