These are the costs given to me by Lord Weaveforger for the smith's time and skill in crafting such an armament; they do not include the cost of the materials themselves. I have added a line to reflect this, as well as a similar one for potions.
This formatting of this document has not changed in 9 years. Nothing has changed but the prices themselves, and the addition of pricing guidelines for new types of goods.
As to the Mage Guild tax, that is up to the Guildmistress to decide how (or even if) to collect. This is a constant throughout the kingdom - the trade of arcane items is governed by the Mage's Guild of Kormyre, and that includes halting the sale of such things. Consider it a reminder to keep good records if you plan on selling anything of that nature.
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((OOG: Cassie Stanley, Marshal Deputy))