I had a horrible noise on the front passenger side and the garage found the outer cv joint was full of water and very little grease The gaiter / boot was intact though, so how would so much water get in?

Anyway they repacked it with grease but it hasn`t completely cured it so I`m probably gonna need a new one (more bl00dy money, starting to p1ss me off now). It needs to be a 6 speed one and rally spec cos they`re so big apparently. Where would I get one without paying stupid money? I`ve had a search but turned up nothing