They have the whole set on Amazon for $20. Comes with the solo expansion. Now, I've tried to order it TWICE and Amazon lost it both times. But maybe you'd get more lucky lol.
I’m in Ireland. I can’t find their games here, and to import from the US is incredibly expensive. I’m happy with the quality I get from my pnps builds, so I’m hoping they’ll add the solo expansion soon 😊
