I've found another fantastic place that I just must introduce. It is a fresh produce and fish shop near Okachimachi station in eastern Tokyo. The shop is called, "Sakana no Yakata." It is a chain store run by a company called Yoshiike.
Sakana no Yakata - Go out South exit of Okachimachi station. Turn left. 5 seconds walk.
Folks, I went to that store for the first time ever and I was totally floored by how fresh the produce was and how incredibly cheap the prices were. It is the closet thing to a real Farmer's Market that I have ever seen in Japan.
The shop was packed with people on a weekday. They had tons of items on sale. Some items, like strawberries, I haven't seen on sale in quite a while.
Other items, like fresh bananas with five bananas in a pack sold for ¥30 yen (35 cents) a pack! My local store, which is dirt cheap (or so I thought) sells them for almost three times that price!
Look for the huge cod
Go out Okachimachi South Exit #1 and look to the left. You'll see "Sakana no Yakata" (魚の館）on the corner. Here is a map.