When I first subscribed to Footnote, I started out with the monthly plan. There is also an annual plan, which of course is a cheaper price per month, but I wasn't ready at that time to commit--life sometimes intervenes.
Footnote has a Footnote subscription options page which outlines the prices for both the monthly and annual subscription. Keep track of when your subscription is due to expire and decide a few days before if you want to continue or not. Footnote's a neat little site, but don't wait until the last day to make a renewal decision--life intervenes.
Footnote offers a variety of National Archives microfilm with an ongoing indexing program-many of these films have never been indexed before--a great source for the genealogist.
