Samsung Galaxy Tab S6 , OLED display ... priced lower than most iPad Pro models.
https://www.samsung.com/global/galaxy/galaxy-tab-s6/
After Apple's margin markup it would be substantially more. But yes if thrown in "ProMotion" , higher color gamut , OLED it would also creep up. But the base OLED tech , Apple is already in the high base cost zone.
Apple isn't likely to go there (to OLED) though. If they are throwing a more expensive camera bill of materials at the device then they will probably also not hugely change the screen tech to something substantively more expensive at the same time. They would have already 'spent' the price decrease on the more mature components.