It's only fitting that a team that has enjoyed one of the most shocking turnarounds in the NFL this season ended with another surprise.

The Cincinnati Bengals announced they have sold out Sunday's regular-season finale against the Baltimore Ravens, a day before the NFL's blackout deadline. The odds of filling up Paul Brown Stadium seemed extremely slim before the team used some creativity.

Cincinnati used a special promotion for season-ticket holders -- "buy one, get one free" -- to record its second sellout of the season. The Bengals can clinch their third postseason berth in two decades with a win over the Ravens.

"Our fans have made a tremendous response this week to our sales efforts, and we thank the entire community for its support of the Bengals," Katie Blackburn, the team's executive vice president, said in a statement. "We're pleased that the game will be on television for everyone, and we look forward to the fans at Paul Brown Stadium giving us a great home-field advantage for a very important game against Baltimore."

If the Bengals (9-6) can knock off the Ravens (11-4), Cincinnati would be headed to the playoffs and in search of its first postseason victory since the 1990 season. The Ravens need to win to clinch the AFC North title and a first-round bye. Baltimore could clinch the division even if it loses, but only if the Pittsburgh Steelers lose to the last-place Cleveland Browns.