I was thinking of purchasing my own portable (pocket) wifi router on Amazon and then buying a SIM card for it in Japan.
The price sounds ($99 link below) reasonable, comes with 1 GB that you have up to a year to use and you can purchase another SIM card as needed.
Problem is, this model doesn't list Japan as a compatible destination. Do you know of a Japan compatible brand of pocket wifi router that I can buy online before coming to Japan?
I know that you can easily rent them there, but I like the idea of having my own, so that I can use it on future travels as well as not have to worry about losing/damaging it or the hassle of having to pick up and return it.