Infinite Supplies: While nothing in this case is actually infinite, thanks to the Laws of Thermodynamics, centuries or millennia of living in space have made most advanced cultures in the Associated Worlds very, very good at closed-cycle recycling; and on a simpler level, well, the cornucopia machine does wonders for logistics problems, inasmuch as – albeit with inefficiency – it’s able to manufacture essentially anything that doesn’t need rare elements or exotic-matter components from fairly simple feedstocks.  So unless you need something particularly exotic or bound about with draconian Fabrication Rights Management restrictions, the odds are that you can get it without too much trouble.