It's hard to find the URL, so here:
https://www.google.com/#hl=en&safe=o...cp.r_qf.&cad=b But you also have to download the tor browser...
https://www.torproject.org/There are forums (basically hidden from the rest of the internet) ON the silk road, but you make a separate account for the forums so you can't be traced....
You can get ANYTHING on the silk road. I got some legal RC's one time, but they were a lot cheaper on the Silk Road than on any other site.
Quote about the silk road:
"And those powerful people have wanted it down for over a year. The DEA doesn't have the resources to take it down and the agencies that do actually benefit from the extra traffic on TOR. And the site owners encourage its discussion because it encourages traffic."
There is a place where you can gamble bit coins, so you can start with like $1 USD and end up with $1,000. But everything is done in bitcoins.
http://satoshidice.com 
