I have purchased it directly through NBA.com before, but the last two seasons I get it free with NBA2k (there is a pre-order edition that includes it and you end up only paying like $80 for it for the whole season).
I love it. Most games in CA get blacked out (I live in HI), some of them I have the local channel for, others I do not. I also had it when I lived in MA. Almost always can get the Spurs broadcast which is nice. I have noticed Samsung TV's don't have an NBA app, so I have to access it via my Roku. If it is the same price, it might be worth it to get it through YouTubeTV so that you can watch it in a native app.