You actually get 2 free each year if you live in GA and then the free one that everyone gets so it's three free per year.
The best way to get your score is directly from the credit bureaus.
I think the one that is the best deal is from Transunion. You get all three reports and all three scores, not just one, for $29.95. This was you can compare and make sure that everyone has the same and correct info.
It's best not to find out your score from your bank or a car dealership or something, it counts as an inquitry and if you have too many inquiries, it will bring your score down.
I used to work finance at a dealership so I am pretty well versed in credit.