SFplanet (Top rated seller with 99.3% positive customer feedback) via eBay has a few iPhone 7/8/Plus cases on sale from just $1.99 with free shipping. Each discount applies automatically during checkout. No coupon code is required. All the cases listed below come in various color options and they regularly sell for as much as $15.  

iPhone 7/7 Plus:

iPhone 8/8 Plus:

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