On Crucial.com normal kit costs DDR5 64 GB SODIMM costs $229.99, though Framework asks $320 for this set.
The LPDDR5X 64 GB costs $329.99.
So if Framework were to price match the vendor, the total price increase would now be $10. Though I am not sure what the price increase would be for the other parts. It does look much more space efficient, so the rest of the board would gain more space.