cdc.gov has price lists for the vaccine. Apparently individual doses are around $1 each. You still need someone to administer it, but Target may be providing that.
As a counter to that view, my daughter needed an eye operation 3 weeks ago, squint correction, 2 muscles on each eye. Saw the specialist, operation 8 days later. If I'd had a choice of date it would have been further away. New Zealand, tax payer funded (so not free as such), socialised cost. Successful operation.
Edit: auto correct issues
It's not "free because it's CVS." If I had no insurance, CVS would still charge me, because they have legitimate labor costs that need to be covered.
I was just making a personal statement. Because it is free for me, there's no financial reason for me to avoid it. But waiting in a line is a hassle, and I have no reason to believe that everyone in line is there for a flu shot.
Good on Page for offering it in multiple places like Target stores. I hope they stick around for a while so people can choose to go when the lines are short.
http://198.246.98.21/vaccines/programs/vfc/awardees/vaccine-... (cdc.gov isn't resolving at the moment)