I'll be going near Bic Camera in Namba on Tuesday so I'll take a look there. I use the area between Namba and Umeda as my exercise walking route, as if it's raining I can do most of it underground, and if not, on wide sidewalks for easier fast walking.
One thing to keep in mind; at these huge stores, often the sales staff don't know what they actually have. Unless you get to the correct department, they don't have a clue. And even IN the correct department, I've often been told that they don't carry something only to find it myself when walking through the isles.