This is kind of a niche product, but Samsung.com is selling their keyboard covers for either the Samsung Galaxy S8 or the Galaxy S8+ for just $9.24 if you have a Unidays account to click through. Free shipping applies to the purchase as well (even though there is supposed to be a $50 minimum).
These are $50 without the Unidays discount.
Link to S8 cover
Link to S8+ cover
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