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Amazon has iPhone X, Samsung Galaxy Note 8, and Samsung Galaxy S8 plus cases up to 77% off with attached promotional codes.

iPhone X Clear Case
https://www.amazon.com/dp/B076BCZSBZ
64% Off, $ 2.50 w/ promo code YTEFCD7Z

iPhone X Cute Case
https://www.amazon.com/dp/B076BC3BDY
77% Off, $ 2.99 w/ promo code HD8YMJZE

Galaxy Note 8 Clear Case
https://www.amazon.com/dp/B074YYV21M