Money and Equipment (CSH)

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The spacefaring economy is at best a "cottage industry." Despite the discussion in this book about trade between the spheres, almost all trade occurs within a single crystal sphere. Only the rarest and most precious items are worth shipping long months across the phlogiston. There is no stock cargo that can be sold anywhere. Remember, the civilizations within the spheres have worlds to plunder for their goods.
Thus, there is no universal currency in space trade. Gold is a common currency and may be the closest thing to universal, but in spheres such as Krynnspace it is subservient to local currency. Money changing fees are 5% of the value of the money to be changed into local currency. Travelers using very unusual currency (such as Krynn steel pieces) may receive even less in trade.
Equipment is more expensive everywhere in space. Raw materials must be brought up from the gravity wells of planets. There are fewer people, thus fewer artisans to manufacture goods. Add 10% to the costs of any portable item in the Player's Handbook. Bulky items (those larger than one person can lift) should cost even more. Many stations even charge for air, a concept alien to many groundlings.
The DM should feel free to declare any item unavailable in a given sphere, either because it is not made there or because there is not enough demand to ship it up from a gravity well. Weapons and armor should probably be available everywhere, but more unusual items are prone to mysterious shortages.