My Basket Shinjuku 5 Chome Store
Located a 5-minute walk from UNPLAN Shinjuku. My Basket is a Japanese supermarket which sells pretty much everything such as groceries, daily necessities, stationary, and toiletries for a reasonable and low cost.
*Reason for recommendation
Everything that My Basket sells is affordable compared to a convenience store or larger supermarket. It's a great place to pick up a quick snack or drink.