Cheapest I could find by a bit right now
While this is the CN version it's identical to the Global version besides packaging and the initial language being Chinese that'll change to English during setup.
Compared to the Mi Band 6 the main changes are a 1.62" AMOLED display (was 1.56"), up to 500nits brightness (was 450nits), 2.5D tempered glass, optional always-on display, 180mAh battery (was 125mAh), improved continuous heart rate and SpO2 sensors, VO2 max & training load, 120 fitness modes (was 30) and over 100 different watch face displays. It remains compatible with apps including Mi Fit, Zepp, Google Fit and more.
Payments via the watch available?