You can find most of permanent equipment with different rarity: heatsinks, spacecrafts, reactors etc. Rarity increases stats of equipment, the rarer — the better. They can only be bought in local stores (Heroware) but local stores sometime run out of stock (which refills every day), while galaxy store can’t sell rare items but always has them in stock.
Rare items change place every month (?), you can check Legendary tracking topic to look for something you would like to find.
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