The new Iced Green Tea displays the "Rainforest Alliance Certified" seal and contains 30% tea sourced from Rainforest Alliance Certified farms (30% is the allowed entry point to use the seal; more details here).
The suggested retail price for the new Iced Green Tea is $1.39 for a small, $1.69 for a medium, and $1.89 for a large.
Additionally, Dunkin' Donuts is featuring blueberry-flavored iced tea one with their regular menu raspberry and peach flavors for a limited time.
The company also regularly offers hot green tea (as well as hot black tea and hot decaf black tea).