they will all be priced higher since it is a product that needs to be imported, and you know...

https://www.amazon.com/NMSLA-Waterproof-Smartband-Touchpad-Wristbands/dp/B07TRKSVJ3/ref=sr_1_5?crid=2ADL4I3PSN94O&keywords=xiaomi+mi+band+4&qid=1563823855&s=gateway&sprefix=xiaomi+mi+band+%2Caps%2C190&sr=8-5

https://www.amazon.com/Lovewe-Bracelet-Smartband-Bluetooth-Waterproof/dp/B07TL84WXK/ref=sr_1_4?crid=2ADL4I3PSN94O&keywords=xiaomi+mi+band+4&qid=1563823855&s=gateway&sprefix=xiaomi+mi+band+%2Caps%2C190&sr=8-4

https://www.amazon.com/Lovewe-Bracelet-Smartband-Bluetooth-Waterproof/dp/B07TL84WXK/ref=sr_1_4?crid=2ADL4I3PSN94O&keywords=xiaomi+mi+band+4&qid=1563823855&s=gateway&sprefix=xiaomi+mi+band+%2Caps%2C190&sr=8-4

I personally would go for the last one at 51 cause it has more buyers and the only bad review seems to have not really a reason, but hey you have also a 35 option there ;)