No, Valve’s rule is that you can’t sell Steam keys at a lower price in different places. You can sell the game at any other price without the potentially-unlimited Steam keys they provide to devs.

Steam key rules and guidelines in the Steamworks docs: https://partner.steamgames.com/doc/features/keys#3

I expected to be trying for a while, but I got mine on my first try, just before the scheduled time (30 minutes ago). Pretty lucky.