Apmex is one of the biggest, if not the biggest dealers of silver as well as gold bullion, rounds, and coins. They have the largest selection of physical silver bullion and gold bullion.
Their Silver coins range from 2012 Silver Eagles to Uncirculated Morgan Silver Dollars, Mercury Dimes, and more.
They also sell at insanely low amounts above spot value. Sometimes as low as $1 which is unheard of when dealing with silver and gold.
They are the best thing and as cheap as it gets without getting into trading silver and gold.
http://www.apmex.com/