Bills +9 now. According to @pfref here are the only #Bills postseason games with bigger spreads (data goes back only to 1980):

1991 AFC Championship vs. DEN, BUF -12, won 10-7
1991 AFC Divisional Rd. vs. KC, BUF -10.5, won 37-14
Super Bowl XXVIII vs. DAL, BUF +10.5, lost 30-13

— Mike Schopp (@Schopptalk) January 2, 2018