For the javascript.
Javascript being client side, it should always be possible to find the value of a variable : var price = 100;
but it is true that if they assign new values to that variable all the time (price=former_price*1.4;), it could be hard to find out what it is equal to.
I had a look at the msn website but didn't find this case. Could you provide the url, or how you found the page where you couldn't access the information ?