Well, here's my report on my shopping today.
A little over 500 Colones equals $1 so this is about $10. It has .950 liters.
This is the 'half gallon' of milk that I buy. It used to be 2 L but now it is only 1.8 and the price has gone up. I can get about 2 liters of yogurt from this and my favorite yogurt that I used to buy, is now 2600 colones a liter or about $5.