Reddit reviews 10KEY Calculator for PC/MAC Red

There are white and red variants of the ALPSulator on Amazon Japan via third party sellers. You'd have to use a forwarding service like Tenso or Zenmarket.

unfortunately, its not an advanced calculator. just a basic calc that switches to 10-key number pad. It does have calculate/send functionality, which I find pretty useful for some situations.

I did a quick search and it looks like the link I ordered from is no longer in stock. Not positive if it exists elsewhere in the amazon.co.jp realm though. https://www.amazon.co.jp/dp/B0044WWDL4
If im reading right, there might still be a red one available, but i could be mistaken. https://www.amazon.co.jp/gp/offer-listing/B0041OYYS0/