Yes, but one thing that is happening is that while the vehicle sale price drops, once the batteries are changed the car resale value goes back up. This garage does replacements for the Nissan Leaf,
https://www.cleevelyev.co.uk/battery-upgrades/ not only can you take your old batteries they can put the newer larger capacity ones in and extend the range of the original car. Costs will come down but Tesla have always been expensive with regards to the batteries.
With regards to battery packs not been available from Lexus, they should search on Wish
BMW’s have issues with mostly the ICE engine in these cars with, oh yes, head gasket failures, there was a video about this on the subject, the ice is so complicated it is beyond the dealers to change even the head gasket!