I just found out about Naked Juice today. It is an all natural 100% juice smoothie that has no added sugar, and has a pound of fruit in 15.2 FL OZ (450mL) of drink.
It is expensive (up to $3 for 15.2 FL OZ (450mL)) but it is probably the healthiest and best tasting (very thick) juice I've had. It actually fills you up.
Here is the site:
http://www.nakedjuice.com/