Costco is running a pre-order discount for Apple Watch Series 5′s. As low as $385 for 40mm and $415 for 44mm. GPS models only, no Cellular versions available at this time.
https://www.costco.com/Apple-Watch-Series-5-GPS-with-Black-Sport-Band—44mm—Space-Gray.product.100517262.html
https://www.costco.com/Apple-Watch-Series-5-GPS-with-White-Sport-Band—44mm—Silver.product.100517282.html
https://www.costco.com/Apple-Watch-Series-5-GPS-with-Pink-Sport-Band—44mm—Gold.product.100517264.html
https://www.costco.com/Apple-Watch-Series-5-GPS-with-Pink-Sport-Band—40mm—Gold.product.100517259.html
https://www.costco.com/Apple-Watch-Series-5-GPS-with-Black-Sport-Band—40mm—Space-Gray.product.100517595.html
https://www.costco.com/Apple-Watch-Series-5-GPS-with-White-Sport-Band—40mm—Silver.product.100517198.html