If you are in Tokyo looking for a SIM free unlocked phone, the 5 inches Windows 10 smartphone BREEZ X5 (CP-X510) might be a cheap option for you.
Equipped with Windows 10 Mobile are on sale at the IOSYS stores. These brand new unopened left over products are priced at 4,980 Yen including tax. The store has 150 units left and the warranty period is 6 months.
The main specifications include a 1,280 x 720 dots of display resolution with Snapdragon 210 MSM 8909 processor. It comes with 1 GB memory and 8 GB of storage. It supports LTE band 1/3/19. This cheap phone is very popular and is selling fast.
Unfortunately, Windows 10 is no longer supported except some random updates of it’s OS.