I have found with my past experiences that Lego is the best company to deal with when it comes to replacement parts.
I found that a couple of my parts broke, shot of an email and they said they were sorry about the parts breaking, so they would sent me new ones. and these were for sets that were 5 or 6 years old.
I asked once if they were going to give away or release a Bionicle mask piece (the Vahi for anyone who knows). They said they weren't going to release it down here, but sent me one anyway.
They are really really generous.
Couldn't have said it better myself.Lego f@#$%^ng rule!
Are you going to get any more?