I did the annual thing and that just let me see my report... not really my score. At least I didn't check anyway.
I checked because I wanted to see if that ****ing medical bill was still on there. ****ing doctors doing bullshit and ****ing up the insurance payment procession.
I think anywhere that lets you check your credit score is going to require payment. I was doing one a little while back that updated my score once a month for a year, which was like $40. Each month it tells you all the factors that go into determining your score too. Unfortunately, I can't for the life of me remember which site it was.
If you want your score, you want one that says something like "all 3 bureau". You actually have 3 separate credit scores - there are 3 different bureaus that all have slightly different scores (different ranges, different methodologies), so you'll want to check all 3.