Hi Ken,
I'm afraid I don't know how to find the best price I suspect that trade buyers will always get the best price. However, you can buy a physical gold ETF which not only tracks the price of gold but also will have a pot of gold stored somewhere by the bank - so it is not necessary to take the bank's risk when you own it. We actually recommend a good one in our Citywire Selection of the best investment ideas out there - you can find the details here.
http://www.citywire.co.u.../content.aspx?ID=385226 . For me this makes more sense than physically buying the gold yourself.
Charlie Parker,
Citywire's investment editor.