You can't buy pastured eggs for less than $7 a dozen generally. The eggs you are referring to are still from chickens who are stuck more or less indoors at all times, and don't get to engage in "chicken-y" behaviors. "Free range" in this case often means there is access to an outdoor patch, but there's no real reason for the chickens to go there, and the are so depressed that they hardly want to move anyway.
As such their yolks will tend to be yellow instead of orange or nearly red, as true pastured chicken eggs yolks will be.
No the eggs I am referring to are from "pastured" chickens. I have seen them go for $5 at a Whole Foods in Northern Virginia as well as the local coop around the corner from me in Syracuse, NY.
