I don't remember what it cost me, but I charged the customer a flat fee of $100 for a box of 40, or so, fittings, IIRC. I used a small anodizing shop in San Jose and would mostly run batch aluminum sheetmetal panels (interior and rear deck wings of the race cars) through them on a monthly basis, so it was kind of a retainer arrangement to include my parts with their larger runs for their computer hardware customers. If I charged $100, it probably cost me $70. Keep in mind that this was more than 10 years ago, now when I had my shop in NorCal. Check with some of the anodizing shops to see what their rates are these days if you can include your parts with a larger batch of the same color.