Anyone that is going to be savy enough to right click, view source, etc is probably not going to buy what you're selling. I can give you a javascript that disables the right mouse click, but you're disabling anyone that might want to right click and open the link in a new window.

Also, I don't recommend requiring Javascript to view a page. I recommend limiting your use of Javascript whenever possible. Most people are going to lose trust for your site when/if they get a Javascript error in their face.