it needs to be sort of thick, but pliable
http://www.tandyleatherfactory.com/Find a store near you. The shield and armor hides are a pretty decent price.
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I've heard other recommendations for Tandy.
...which is fine IF the OP is American....
They ship and have stores internationally.
Well, Canada and one in the UK. Good store, fantasic catalogue too. I am really jealous that you HAVE resources like this in the USA - but if this guy is in the North of England for example, I'd suggest Guest Leathercraft in Bolton - who stocks Tandy accessories, having been their UK manager for a few years.
What can I say? It's great to be Texan :D