Or the restaurants or cocktail bars that happen to have tablets instead of paper menus.
They started with iPads, but as their chains got bigger they moved to a mix of Android and W10 tablets.
Source, personal anecdote getting out of the menu app into the OS.
Most of the tablets I've seen in stores and restaurants are actual iPad hardware, the virtual keyboard used when entering information is the iOS keyboard, and the Square app follows the Apple design guidelines.
And the rare occasions when I encounter an Android tablet, I recognize it from the virtual keyboard. Case in point: the food hall I mentioned in my above post. When you buy something, it asks you if you'd like to enter your phone number so they can text you when your order's ready. When I chose to enter my number, I instantly recognized the keyboard for that as the Android 4.x keyboard.
On top of that shop owners tends to rely more on local vendors for cash machines, and many of those still heavily built atop of the Windows ecosystems. In fact I wouldn't be surprised if W10 surpassed Android for this kind of appliance. Here in France I often see waiters use device with old school stylus on UI with really small buttons. I'm not even sure what OS this is to be honest.
Or as alternative go to a local games developer meeting group.
There were plenty of them in San Jose at GDC, from what was shown on the live streams.
Tablets are rapidly taking over the market for cash registers.