Help needed! Looking to purchase a digital blood glucose monitor but couldn’t find them anywhere in Tokyo. Just arrived in Osaka and looking for a place to buy one.

Hi everyone, really appreciate your help with this! I just arrived in Osaka after spending 4 nights in Tokyo. I've been feeling off the past couple days and would really like to check by blood glucose levels using a digital monitor (like this). While in Tokyo I visited 3 different pharmacies and ~10 different drug/cosmetic stores and nobody has been able to point me in the right direction on where to get one of these.

I'll be in Osaka for three nights, then headed off to Kyoto. Would very much appreciate anyone recommending a place I can purchase a digital blood glucose monitor while in Osaka. Thank you!!