Do It Yourself!
You can buy anodising kits from 70-odd quid and if you're thinking of tinkering or need the odd part done here and there then it makes it more cost effective.
It's very easy to do and a lot of places will supply you all the kit you need, eg:
http://www.speed-demon.supanet.com/anodise.htm Half the fun is in doing it yourself
