I was looking for an alternative for Casio F-91W and this model came up.
Good thing I chose this too, because larger models will appear comical on my wrist.
Casio has a store locator online! & obv you can purchase online from many different sites! For Japanese only models, you can find reputable seller websites, like Sakura watches, or eBay.
I would be in heaven if Casio would make this exact watch but with the ability to do a vibration and show a little bell icon on the display when you get a notification on your phone. No fancy pants smart watch functions just a regular old Casio that can alert you when you get a notification. I know this isn't really possible because adding Bluetooth would decimate the battery, but I'm so disillusioned with all the smart watches that have full color displays and a million features I never use when all I really want is to tell time and be alerted to notifications without hearing a sound.