Trader Joe's does not sell pre-made bulletproof coffee as of 2015. However, all the ingredients for bulletproof coffee are available at Trader Joe's. Bulletproof coffee is a mixture of coffee, unsalted butter and MCT oil or coconut oil.
To make bulletproof coffee, brew coffee in the usual manner using high-quality coffee beans. Add 1 or 2 tablespoons of unsalted butter, and 1 or 2 tablespoons of liquid coconut oil. Pulse the mixture in a blender until it is frothy.
A vegan recipe for bulletproof coffee at BreakingMuscle.com omits the butter and uses 1 or 2 tablespoons of coconut oil instead.