Amazon.com: Compatible for Samsung Galaxy Watch 4 Band 40mm 44mm/Galaxy Watch 4 Classic Band 42mm 46mm/Galaxy Watch Active 2 Band 40mm/44mm,20mm Breathable Sport Band for Galaxy Watch 3 41mm/Watch 42mm/Gear Sport :
Insten 3-pack Band For Samsung Galaxy Watch 4 40mm 44mm / 4 Classic 42mm 46mm / Watch 3 41mm / Active 2 Replacement Wristbands 20mm (black+blue+green) : Target
Protective Case For Samsung Galaxy Watch 3 41mm 45mm Smart Watch Cover Bezel Ring Frame Shell Protector Smart Accessories Ring - Smart Accessories - AliExpress
Samsung Galaxy Watch 4 vs Galaxy Watch 3: What are the differences?