Perhaps this is "old news" -- but it is new to me.
It appears that new 24kWh, 30kWh, and 40kWh battery packs are now available for purchase at some online parts outlets (like www.nissanpartsdeal.com
(to name one) w/ the following info):
24kWh w/o CW: 295B0-9RB9E $4739.82
24kWh w/ CW: 295B0-9RB9D $4739.82
30kWh w/o CW: 295B0-4NP9A $9555.40
30kWh w/ CW: 295B0-4NP9B $9555.40
40kWh : 295B0-5SA9B $11,231.00 ($10,640.00 @ TASCAParts.com)
All seem to have a fixed $1000 core charge.
I couldn't locate any 62kWh battery packs for sale.