Not quite as good as the earlier D23 member 3 years for $140, but still a savings:
3 years for $170: https://founders.disney
2 years for $120 https://founders.disney
It looks like the codes are individual single use. I deleted mine from the links above since they have been used by other SD-ers. So, YMMV, watch your email and see if you get the offer. Good luck!
The service launches November 12, 2019. Lots more information on the Disney+ service and what it offers: https://www.tomsguide.c