Hi there!

There are many versions of the game available for PC that are matched with the mobile version - the differences you're referring to are between the paid versions, distributed by third parties, and the free-to-play versions that we support.

If you wish to try a free-to-play desktop version of the game that comes with support from us, you can download it from Steam here:

https://store.steampowered.com/app/949050/Virtual_Villagers_Origins_2/

And from the Windows Store:

https://www.microsoft.com/en-ca/p/virtual-villagers-origins-2/9pdm6gwqb6zm

You can also play the game directly in Facebook or the Facebook Gameroom app on a desktop computer:

https://apps.facebook.com/villagersorigins

Regarding the paid version you're playing, there are many other ways to earn Lavastones and Tech Points apart from buying them in the Marketplace - you can earn them through random events in the game, the trading ship, exploring volcanic cracks, the Lavastone Generator, the daily reward calendar and much more!