The ammonium chloride, and zinc chloride are part of a kit I managed to buy. The bits separately were more expensive than paying for a packaged kit. The expensive bit that helps is a really good power supply.
The hardest bit is the cleaning, everything has to be spotless, the plating then takes 30 mins
If they are small enough and spotless, you are welcome to see the results!
About £80, not including the power supply Neil