I'm working up notes for a play-by-post Gamma World game. The home town will be fairly primitive, just having barely reached Tech Level II (early Bronze Age) but there are some definite Tech II and even a Tech III (Medieval) settlement nearby. Plus a market in the Tech III settlement run by Restorationists where artifacts can be bought and sold...the only catch being that the Tech III society is ruled over by the Knights of Genetic Purity. There is a trade town nearby as well, which takes domars (cash in Gamma Terra), but the home town will be only barter based. Junk from ruins will be a prime means of acquiring things, but time and effort also play a part. A day's food? How about you give me that shiny doo-dad you picked up in the ruins. Want a new spear? Plow my field for me.
I plan to have notes for important NPCs of what they have, what they need, what they want in trade. But for less important NPCs, or when the PCs want something I haven't considered, I made a Barter Table. Figured I might as well share it with you guys. Never know when this might come in handy. It could work for D&D or other games, too, really. Just replace junk with something relevant to the campaign.
Junk: On average, 1 curiosity = 20 junk/5 baubles; 1 bauble = 4 junk;
Labor/Service in hours; labor = physical work, service = mental work
Goods: 1 Tech III item = 10 Tech I items or 3 Tech II items. 1 Tech II item = 1d3 Tech I itemsNothing: free if NPC is friendly, will not trade if hostile; No Trade: will not part with item