And who'se still walking around decked out with metal equipment for the same price as most places, or worse, non-existent metals like Mithril?
Actually, I just checked it again, and the Athar ruleset states that you can have metal items, as long as you spend 100 times the normal price on it.
A starting money of 13000 gp in regular D&D equals 13000 Cp (=130 gp) in Dark Sun.
Any normal nonmetal item that would cost XX gp in regular D&D would cost XX Cp in Dark Sun.
Any metal item that would cost XX gp in regular D&D, would cost XX00 XP (=XX gp) in Dark Sun.
So a longsword that normally costs 15 gp, would cost 1500 Cp (=15gp) in Dark Sun. A masterwork version would cost 300 Cp more or 1800 Cp (the equivalent of 1800 gp in a normal universe).
There are also stone (heavier than normal, but most durable after metal), wood (lighter than normal, but less durable than stone) and bone (half normal price, -1 to hit, -1 damage) variants of most items that have the associated cost in Cp. Thus a stone or wooden longsword would cost 15 Cp, while a bone longsword would cost 7 Cp, 5 bits.