Lol, well, if by anyone/someone, you mean me, you'd be taking a leap of faith. You can check the Swap forum...I've made some swaps there, and my name isn't on the complaint list. I have a 100% Ebay feedback rating. I'd measure out the solution by weight...I have a food scale.
As for buying from "anyone/someone" else...well, I can only speak for myself.
Your other option is to buy it yourself and do the splitting and shipping on your end...which would then require "anyone/someone" else to take the leap of faith in you.
As for the exp date...I won't know until I see the bottle. I bought my current bottle of Gold in early 2010, and it is set to expire in Oct. 2013. I don't know its production date, though.