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As I read it, it is just the base cost for the weapon that is doubled, right? The only extra cost to enchanting the weapon is the +2000 gold. So a coldiron longsword +1 would cost 4,330 (15 base x2=30, 300 mwk, 2000 to be able to enchant it, 2000 for the +1 enchantment).
"Weapons made of cold iron cost
twice as much to make as their normal counterparts (not
counting masterwork costs). Also, adding any magical
enhancements to a cold iron weapon increases its price by
2,000 gp. This increase is applied the first time the item is
enhanced, not once per ability added."
