Exactly - in all the times I've stayed there, I've never shelled out for the hotel's breakfast. I usually make a stop at the convenience store a few times a day (on the way out and on the way in to the hotel) to pick up snacks/drinks for the room.

We've made it a bit of an activity to explore and load up on stuff. It's driving me nuts, but I can't remember whether it's Family Mart, Lawson, or 7-Eleven. It's on the upper floor - you go down the escalator but to the level above the lobby and exit. There's an elevated walkway that you can use to go to Takeshiba Station and on the way, you duck back into the building and it's right there. If you go down to the street level, there are some eateries on the corner near Takeshiba Pier and more convenience stores.