Where in Ueno? Let me go check it out to see if it is cheaper than North America. Thanks.
Ueno = 上野. You can take JR Yamanote line 山手線 to go there. From Shinjuku to Ueno ard 25 minutes. Recall my memory, Kayano & GT-2140 cost ard 13K~14Kyen.
You should be able to find out some more information.
Last time, another c-hing PM me an email of the manager of the store. Although I don't have the chance to go there after receiving the email, you may try sending an email to the shop manager & check for the price to save your traveling time.