I like Chamba Chai. It’s a mix often found at Costco and similar stores. It’s delicious and sweet, good either iced or hot, goes great with coffee.
Oregon Chai used to make a concentrate that was chai + coffee (or espresso) that was super tasty.
(I don’t drink Chais very often, because to make them taste the best, they need cream or full-fat milk and added sugar.)
The best Chai I ever had was from an Indian cultural festival. (Maybe ask around at some ethnic or indian stores?)