For Prime Day, Amazon has both the Apple Watch Series 9 GPS 41MM Midnight Aluminum Case with Midnight Sport Loop for $279 (regularly $399) and the 45MM model for $309 (regularly $429) with Free Shipping for a limited time.

The series 9 features a much always-On Retina display (with up to 2,000 nits), S9 processor that’s 30% faster than the S8, 4-core Neural Engine that is up to twice as fast as previous, on-device Siri, 64GB storage, third-generation optical heart sensor, electrical heart sensor, temperature sensing, blood oxygen sensor, and Crash Detection.

Amazon’s Prime Day deals are exclusively for Prime Members. If you are not a Prime member, Amazon is offering select users a 30-day Free trial.