Here is the thing about this, if you have ever had it in the restaurant you will be disappointed it doesn't have the same rich flavor or texture! If you have never experienced it at a location than its pretty good! Can be bought on Amazon.
I tried serendipity for the first time in NYC after hearing about it from oprah. Their frrrozen hot chocolate is by far the most decadent, rich, delicious dessert I have ever tried. It's too bad it's only available in NYC and Vegas.