The Mithril Armoury was a website selling Lord of the Rings film merchandise. In particular, they sold the officially licensed swords, helmets, staves and shields produced by United Cutlery, as well as some non-official Tolkien-inspired.
The Mithril Armoury is well-known to collectors and has a solid reputation (albeit slightly mysterious) as a dealer of Tolkien-related products. It is a regular advertiser in the Tolkien Society's bi-monthly bulletin, Amon Hen journal.
As of the 19th of January 2007, their website seems to be down so the Mithril Armoury may have ceased trading.