Taco Bell $4 Duo’s Usual Combo

As part of its collaboration with Duolingo, Taco Bell is offering a limited-time $4 combo deal, “Duo’s Usual,” at participating locations nationwide through October 12, 2026.

For $4, Duo’s Usual includes a Doritos Locos Taco, a Soft Taco, Cinnamon Twists, and a medium fountain drink. The deal is limited to Duo’s Usual per order. Just the two tacos alone would normally cost around $5.

Duo is the owl mascot for Duolingo. Taco Bell also has a new Duo Habanero Sauce for a limited time.