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Amazon has Samsung Galaxy S8+ S-View Flip Cover with Kickstand various colors on sale:
Orig. Price: $ 60:
Blue: $ 24.98
Black: $ 25.80
Silver: $ 28.71
Orchid Grey: $ 29.25
If you are looking for the same cover for S8, black is $ 29.95, silver is $ 27.53. (Link [amazon.com])