I'm guessing the price would be similar to the LX600 if Toyota kept the 300-series LC in the US.
150K is a lot more than the most expensive LX600 trim which costs 130K.
To give you an idea of the pricing in a couple of markets, let's look at the GR's pricing in Japan, UAE and Australia.
In Japan the GR cost 7,7 million yen or 53K USD (direct conversion)
View attachment 3366812
In UAE the GR cost 412,900 AED or 112K USD (direct conversion)
View attachment 3366814
In Australia the GR cost 152,178 Australian Dollar or 100K USD (direct conversion)
View attachment 3366815