Sam’s club member or membership in family is the easiest way now? Not sure if government has A-plan access. There is no centralized list I am aware of, but you can ask your local Volvo dealer if your government organization has access to it. My S90 deal was at the end of 2017 and the programs have adjusted since then. The key with the S90 is that there is an extra $3000 rebate which drives the monthly cost down dramatically.
I would recommend reading through this thread for more recent information: