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Amazon has several AmazonBasics iPhone 7 cases on sale with free Prime shipping.

AmazonBasics Dual-Layer Case for iPhone 7 [amazon.com] | $ 0.97
AmazonBasics Clear Case for iPhone 7 [amazon.com] | $ 1.03
AmazonBasics Slim Case for iPhone 7 Plus (Dark Grey) [amazon.com] | $ 1.22

Orders $ 1.01 and over are eligible for no-rush shipping to get a no-rush shipping credit.