i tried the whole coin store thing and found that ebay was cheaper.
this is a pretty good investment
http://cgi.ebay.com/100-FACE-VALUE-90-SILVER-DIMES-NR_W0QQitemZ320037976625QQihZ011QQcategoryZ39459QQrdZ1QQcmdZViewItem
you don't really want to buy few coins here and there....it always comes out cheaper to buy it in bulk. You are getting about 73 ounces of silver here so you are paying exactly what silver is trading at.....plus the coins atleast have a 100 dollar face value.