by the way, the one that you posted is not worth getting. I don't think you understand how small that is (9mm x 15mm). The ones that I posted above for 600 bucks are only 1 5/8 inches tall and 15/16 inches across. They are not even an inch across!!! The ones you are getting are probably the size of this "0" <----i'm exaggerating a little bit.
I was also buying these a few months ago for around 500 bucks. Now they are close to a 1000. This is a good way to invest also.....if the economy ever crashed our paper money would be worthless and then people would start using silver/gold coins. I don't plan on anything like that happening, although my investments in physical commodities have been doing awesome.
http://cgi.ebay.com/1000-Mercury-Dimes-US-90-COIN-SILVER-100-FACE-VALUE_W0QQitemZ330005769565QQihZ014QQcategoryZ11960QQrdZ1QQssPageNameZWD1VQQcmdZViewItem