If they are small parts ,you might want to check out this link,
http://www.caswellplating.com/kits/aluminum.htm .........I've seen some home done anodizing on JR Dragster parts and some stuff on a few Hot Rods that looked very professional, and the guys I talked to said it was very simple to do......A plastic tub ,chemicals and dye and a 12 volt battery and charger!......Tom