According to Businessweek, paper coupons are still thriving. In the first half of this year, consumer packaged goods companies distributed 171 billion coupons. 92% were in booklets founds in Sunday newspapers.
Digital coupons, are less than 1% of all consumer packaged goods coupons. Use of the printed coupons is universal. Even those who use digital coupons, also use printed ones.
Source: Businessweek, Nov 17-23, 2014, p. 24.