As a baseline Submariner, you MUST remember these, or you will run out of money really fast. Ships without Deconstructor are strongly discouraged to use in Campaign for this very reason.

• I dont think i have to yap about the importance of Ammo/ Fuels.
  
• Storage Container is GOD tier item, letting you carry 12 medium-sized items with one slot, and CAN be stored in lockers. It can even contain Oxygen tanks, Scooters, smaller guns, Ores, Materials, Medicines, Alien loots, etc. your storage lockers should be ideally filled with these.
  
• Harpoon is for Harpoon gun. it is super cheap, can be used underwater, and packs some punch enough to deal with nasties up to Mudraptors. anything larger than that, or group of them, should be dealt with combination of other items like stuns/ poisons/ steroids. Recommended to carry in form of loaded Spear guns, as it cannot be stored in Toolbelts.

Legend
Listed Price are all the cheapest price. all shops sell only a handful selection of items, depending on the outpost type.

NOTE: quite a few things are still WIP, namely prices and Deconstructability.

Bold: Recommended way to get or use it
Underline: Intermediates
Italic: NOT Deconstructable, aside from the obvious ones.

Protip: As far as i tested on Singleplayer mode, Enemies will NOT spawn until you undock, NOR straying from sub too far away (>200m). You should Repair, Restock, Gather, Sort bunch of stuff at this paticualr moment, and just get back to the map screen when done to save the progress.

The amount below is vastly on the safe side that assuming you will go through 15 or more missions, without being able to access appropriate shops. if you are just scratching surface, you could do with whole lot less.


Things you should buy at Mining:

Steel (100) for pretty much everything. if you have tons of money jsut buy 100 more.
Phosphorus and Sodium (100 of each) For UEX to make Explosive ammo on everything
Uranium(100) For fuel and Nuclear Shell
Sillicon and Carbon (50) For Plastics
Aluminium (50) For Oxygen cans, extra ammo cans, and Compound N
Titanium (20) for Ballistic fiber / Piercing shells if your coilgun has more than 1 loaders for each
Potassium(30) For Compound N
Thorium if you are richboi


Things you should buy at Reserch:

Opium (100) for all your Internal Damage needs
Broad-spectrum Antibiotics (50) for Calyxanide (keep some to administer simultaneously)
Stabilozine (50) for bunch of drug mixing
Sulphuric Acid (50) For Compound N


Things you should buy at Military:

UEX and C-4, If you are richboi
SMG, Riot Shotgun, and their ammo, if your ship lack some personnel defence capability