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Teclan via Amazon has select Cases for Samsung Galaxy S7 on sale with prices starting from $ 3.99 when you apply the corresponding codes listed below. Shipping is free with Prime or if you spend $ 49 or more.
Note, make sure the case is being sold by Teclan as seller and fulfilled by Amazon for promotional code to apply properly.
1) Samsung Galaxy S7 Case, Standard
$ 7.89 – $ 3.9 promotional code P72K48FA = $ 3.99