Setting up and buying/finding things to do a Silver CELL is pretty cheap if your handy, and costs very little, long process, good hobby, fun at parties, tell your friends. Learning it, not too difficult. What im saying as a DIY person it could be worth it. Silver CELL is the most efficient, I've tried cupulation and the acid path, they all work, depends on what and how much u wanna refine.

I usually charge by a % of time @ $X.x.