Browse preloved hard sci-fi on QuelPosto, the marketplace for buying and selling almost anything second-hand. New listings are added every day — check back or set up a search.
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Buying preloved hard sci-fi costs less than new and keeps usable items out of landfill. Payment is held until you confirm the item arrived as described, so you are not sending money into the dark.
Listing hard sci-fi is free and takes a couple of minutes. Set your own price, post when it sells, and get paid once the buyer confirms delivery.