Marumo is a supermarket in the eastern part of Tsukuba. It has a diverse section of seafood, good prices on all kinds of meat, and a great deal of discounts from time to time, as well as sporadic free samples all over the place. They have a free car park.
They offer a Reward Point Card, with a rate of roughly ¥100 : 1 point.
By the side of the supermarket you can find Marumo's liquor store.
The website is not updated often.