Found another way to (potentially) many some nice money. Gem mines. Been doing a few trips and getting some bling. Buy the Prospecting Gear at Roo's and give it a go. I think I have only found one gem mine, but one is enough :D
I know you can get some at Kahill Outpost. You need the prospecting gear and then scavenge. Not a guarantee, but I've had good results. Take a good tent as it's more efficient to stay a few days.
