You also what to watch out with "cheap". A lot of times "cheap" means that their setup and knowledge/experience isn't their.
Anodizing isn't like paint where you can sand it down and have someone do it right over again. Your dealing with many chemicals and mixtures of current and chemicals that can destroy an aluminum part if they are not applied in the correct manner.
Lack of any one of those can end up being bad.
Don't mean to scare you. Just fair warning.
If the guy has a good track record and hes cheap...go for it.