The new Intel Alder-Lake HX based laptops feature up to 4 DIMMs, so they can be slotted with 128GB. (but there is catch... it's DDR5 and DDR5 in 128GB Alder-Lake config runs on much lower frequency...)
The HX laptops are few and fairly recent, and run the gamut from high-end gaming machines (Asus Rog, Dell Alienware, MSI GS, etc.. ) to work-stations (Dell Precision, HP Z-book, MSI Creator, Lenovo P,...).
Only some of those have the choice of 4 DIMMs and thus 128GB, and those few (like Dell Precision for example) only offer so in very expensive packages this year (Dell charges almost 2000 bucks for it alone because they made proprietary form-factor and will only sell normal version later this year who know when).
In short, it's expensive thing right now in this generation, I would settle for 64GB. Corona team is making out-of-core bitmaps caching right now for this version so that will save some memory on big projects but yes I know, 128 is super convenient.