@dolanders Sorry I don't have one. You can try some YT (YouTube) channels I know some such as Stadiacast give out buddy passes from time to time.
Also (just in case you are not aware of it) a buddy pass alone will NOT grant u access to red dead. You still will have to purchase the game, even after you get a buddy pass. Just throwing that out there in case you didn't know.
Free tier should also be coming out "soon" (I'd say by the end of the month) so just keep checking up on that as well.