The vendors I am referring to no longer work from a human powered push cart, but a micro-van, and offer things like crepes, melon flavored bread, agepan, and espresso.
Here's K ordering a café mocha outside the big electronics store called "K's" (sorry, I can't get you a discount - it isn't her store). The vendor - a franchise called "Motoya Espresso Express" sets up next to the main entrance.
On board his tiny van is an espresso machine with which he will make you a fresh cafe latte, espresso, cappuccino, or other coffee delight. K's café mocha was ¥260, or $2.22 US. He uses quality coffee and does a great job preparing it. I also like the latin jazz he has playing softly over a couple of marine speakers.
It too is a franchise business - "Kyushoku-toban rokugosha". Agepan is deep fried bread which is rolled in the flavoring of your choice - sugar, kinako (soy bean powder), cocoa, cinnamon, or cafe latte. In cramped quarters the woman operating this van makes the agepan fresh to order. Price: ¥100 (about 85 cents US).
Of course it has occurred to me that these two businesses might do better if they parked closer to one another. On the other hand, if people were presented with too many items of food, perhaps they'd just leave for a restaurant. A single small item is an easy impulse sale - especially when it tastes so good. Whatever the reason, it's probably a good thing for my waistline that they aren't side by side.
*Title Trivia: The title seemed to fit the espresso van business. "Cafe Au Go Go" was actually a nightclub in Greenwich Village, New York, where many famous blues, folk, rock, and jazz musicians performed. Comedian Lenny Bruce was arrested there in 1964 for using "obscene" language in his act. One of Pandabonium's first jazz albums was "Getz au Go Go".