I used to deal with metal platers and in-house plating all the time, but it has been so long my memory is fuzzy LOL
Try
www.caswellplating.com They offer anodizing, nickel, zinc, etc in small quantities so you can do it at home. I don't believe we did any anodizing in-house, but I used to get black oxide and nickel plating solutions from them which are pretty easy to do at home, just wear a mask LOL That stuff will burn your nose hairs off.
Also try
www.eastwoodco.com, they have a lot of home use products.
I would shop around your area for vendors that do this too as it may end up being more cost effective for the small run you are doing, unless you decide to anodize more stuff.
If I think of anything else, I will let you know.