Warior of Arnor missing right arm, where could I find a replacement?

[El Chintete]

So I'm starting up an Arnor army from the Lord of the Rings to use with One Page Rules' Age of Fantasy. I found some Warriors of Arnor by Games Workshop I bought years ago. One of them is missing his right arm, the spear arm. Anyone know of a store that sells 28mm right arms holding spears that scale to these minis? 

[Hobgoblin]

Just a guess, but a Fireforge or Perry plastic sprue might give you some options for arms of similar scale (you can get individual sprues cheaply on eBay, and they usually have lots of spare arms).