One of the sites I use to add volume to my stack is SD Bullion. I really like them due to the fact that they have really good prices on the high volume stuff and their shipping is pretty quick. I did not like the fact though that they did not take Bitcoin until now...
Their site has gone through a complete overhaul and they now accept Bitcoin for a slight premium. Its about 1% additional charge which is not that bad. If you are looking to convert some crytpo into gold and/or silver, check them out!
I am Lord 
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