$0.99 + S&H, and let the price rise according to demand. 3 cents a coin seems a reasonable expectation but with people bidding from a low starting price I would expect competition and a higher final value than that.
I'd start them at $20... to ensure you get $0.02 ea, and let it go from there. No need to say whether they are searched or not. Just DON'T say they are Un-Searched!