TolkienTown.com has some great stuff, many originals, but their stuff is generally quite high. I wouldn't buy jewelry from them, even if you have enough money to buy the expensive stuff...buy it from NobleCollection. However, there is a little costume broach available on TolkienTown
here.
A few other sites you might check out are
New Line's Official LotR Shop,
www.bladesbybrown.com (mostly blades) and I got MY broach from
Lordoftheringscatalog.com. They were having a sale, and I got it for $40. Sweet deal!