* Stationary at places like Itoya in Ginza (if that counts as tools).
* Go to Yodabashi camera and just have a look around and you will find things you suddenly _need_. I bought an alarm clock and had literally hundreds to choose from.
* Nail clippers, tweezers, etc. you can get from just a general drug store are all very high quality (or so packaging showing them being hand sharpened leads me to believe).
Fountain pen. They make some of the best in the world, and if you treat it right it will last your whole life. I've got one that's almost 15 years old. I fill it when it's empty and it's the only pen I use.
From an environmental stand it's great because it's reusable.
From a writing stand it's an amazing feel every time I write.