I love my Aerolatte to go for making Bulletproof® coffee, at home or on the go in its container. The Aerolatte runs for ages on its 2 AA batteries. Only trick is to pulse it on-off to avoid spilling over the edge of a cup.
I highly advice the Aerolatte for travel and at home, as an alternative to using the blender.
I got the Aerolatte to go from a local cooking shop. Amazon also carries it: Aerolatte to go.