Easy money and items
Go to Beta Centauri and mine all the moons. All of the moons here have 48 of all three items and the respawn rate is very high. You can easily fill your cargo holds relatively quickly. Then, go somewhere that will buy your cargo and sell it all. It helps if you have all of your Psi so the patrols do not nail you for having Contraband. If you successfully fulfill all three counts, you will get 192 of each item. If you are looking for specific items that you need for crafting, the ones available here are as follows: Food, Polymers, Minerals, Alloys, Technology, Isotopes, Crystals, Gold, and Contraband (everything except Medicine).