Best way to get chromium transistors

The first and the 3rd types for relics are proving to be the biggest pain in the backside... for the first one I just grind that one level for 6 energy that gives u the 4 types needed for it with the possible 3 drops of the 1 kind (would have to look up the level but pretty sure most know what I'm referring to) the transistors r a bit more difficult tho.. is there 1 of the 150s that's very easy to put together that most people gun for or just grind 1 of the lower nodes? Thoughts/help would be much appreciated and thank u in advance.