Please stop saying it cost ressources
Everyone say that but even with 2 retainer you can have 75% of all comp

If you aim for ALC which is some of the easiest one (only 2 books available for Red script)
You only need miner and DoW/M to gather everything

Then craft

The only comp i buy from MB is zêta from ALC because it's à pain to craft and maps give a tons of them and people sell them cheap