Maman Macrobiotic Bento meals (photo of example) can be bought at the following stores;

Natural House Aoyama shop:
Closest station/Ginza Line and Hanzoumon Line Omotesando Station B4

&

Natural House Shimo-Kitazawa shop:
Closest station/Odakyu line and Keio Inogashira Line Shimo-Kitazawa station West Exit

www.naturalhouse.co.jp

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and also at

Queens Isetan Shirokane Takanawa shop:
Closest station/Toei Mita Line and Nanboku Line, Shirokane Takanawa Station
Shirokane 1-17-2

http://www.queens.jp/shops/tokyo/15_shirogane.html

Look for a concession called 'Little Maman Corner' at these stores.