Until today, I sold all my land and was left with just one.
I never got enough grains for my letters to "work". I don't know exactly where to buy it.
I saw very superficially that the best alternative would be for the players themselves but I don't know where. I even believe it would be something like P2P.
There is an internal market. When you click on play land you can get there. Let me know how much grain you need. And your splinterlands username.