Bic in Yurakucho is huge and access is easier than Akihabara but may have more domestic versions than would Akihabara.
Would look online and then search where the model you want can be bought. Amazon may even stock it.
Thank you - actually this location is my usual go-to for stuff because it is away from the tourist areas and has a huge supply of everything, but it's hard to compare prices between shops since it's the only one in the area. Of course all electronics in Japan are YMMV given I was just at Bic yesterday looking for a plug in USB charge plug and they were selling the same 1amp plug for US$13 I can buy at Walgreens for $1.
I should check Amazon, you're right - if I can find the same device from Amazon for a similar price, it saves me the hassle of dragging it home with me.