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Apple Watch Series 3 GPS, 38mm, in Space Gray Aluminum/Black or Silver Aluminum/White for $199 with Prime Shipping from Amazon. Regularly $279. This is basically Prime Day pricing.
Unknown end date, may end at any time.
The 42mm Space Gray Aluminum/Black one is just $229 as well (list: $309). You can also opt for the Series 3 GPS + Cellular in 38mm Silver Aluminium/White for $299 (list $379).
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Optical heart sensor
S3 with dual-core processor
Accelerometer and gyroscope
watch OS 5