Thanks for the heads up Felly. Spydercos are available in some of the better knife stores but they are not cheap. Sometimes you can find older models that have been sitting on the shelves for a while. The concept of sale prices or discount pricing is not very widespread at all. I know of a few knife stores in Tokyo as well as a few other locations. I have a Ti Delica but I bought it here by mail order rather than on one of my trips. I would consider looking in the stores for other brands as well as Spyderco that have different non-imported models.
Of far more importance to any knife guy that wants to travel and purchase knives in Japan are the rules about carrying knives. Even though they have a long history of edged tools they also have very restrictive laws with very harsh punishments. A foreigner with knives is a very attractive target for the police. As far as carrying a knife in my pocket I stuck with a Swiss Army Classic. Everything that I bought I sealed into slender shipping boxes and sealed as I was carrying them from the shop thus giving myself the excuse of "taking them to the Post Office to ship". Recently a driver found with a small camping knife of over 2.5" blade length was sent to jail for six months. He had a SAK knife in his glove box. Japan can be a great place to shop for knives and can be a lot of fun. You just need to be careful.
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