[2019] Are R&D packs "buy-only"?

Originally posted by TuTTi-NuTTi:

Originally posted by SpectatorX: You have one for free.

I know there is one for free.
What I mean is, are they going to add challenges that award r&d packs, or will they remain obtainable by paying for them

You can only get them by purchasing the packs.