There is a T and tank up for sale - both with the word "love" silk-screened on. The L is actually written out in kanji and means love in Japanese. Both retail for $35.
The shirts are available online at Odin or in their stores. I picked one up after work this week since I was in the area anyways and its a great T for just lounging around in and is super soft. The shirts are made by Alternative Apparel (which by the way does great basic and burnout Ts if you're in the market for those).
Japan Ts: Paul Smith, Anna Sui, Opening CeremonyIf you're looking for other Ts to help support Japan, Anna Sui, Opening Ceremony and Paul Smith also have their own T to support the cause just to name a few.