Plasteel

[Shurp]

Just keep in mind that getting enough material to build a ship to escape the planet is *supposed* to be difficult.  There really shouldn't be any plasteel lying around on the map.  Mechanoids will give you what you need for the multi-analyzer, and when an exotic goods trader (orbital or caravan) shows up you can get your gold.

Anything more than that you should buy.  After your devilstrand farm is complete