Sport shop / jimbocho
South-West from Akihabara is the "second-hand books area" named Jimbocho.
From Akiba, go south and turn right on Yasukuni dori. All the way to a large victoria store, the street is lined with sport stores.
Once you have reached Victoria store, turn to your left at the big cross-road: you are in "Jimbocho", the book/mags/art area...
If you go north at the big crossroad, you will reach "ochanomizu" area, know for its universities and music instruments stores...
Poras Raoul Jean Raymond ポラス ラウル ジーンレイモンド