Details from website below:
Offers end 7 Jan 2020 at 11:59 p.m. ET. Discount only applicable for 6-month subscriptions. Offers available for new and returning subscribers only and not for renewal of current subscriptions. Billed in one payment of $49 for a 6-month subscription to U.S. Discovery, $74 for a 6-month subscription to World Explorer, or $99 for a 6-month subscription to All Access. Your subscription will automatically renew at list price after the introductory offer. If you don’t want to renew, cancel at least two days before your renewal date by visiting the My Account section or by contacting us. See our Renewal and Cancellation Terms for further details.
https://www.ancestry.co