Smiry via Amazon [amazon.com] has 30" x 70" Smiry Waterproof Sofa Cover & Blanket for Dogs (Grey/Dark Grey) on sale for $13.99 - 50% when you apply the coupon on the product page = $6.99. Shipping is free with Prime or orders $35+.
Dark Grey/Grey [amazon.com]：$6.99
Grey/Dark Grey [amazon.com]: $7.99
Features:
Microfiber
4-Layer design
Machine washable at around 86℉. It is recommended to use mild detergent rather than bleach.
About this Product:
This has a 4.4 out of 5 star overall rating on Amazon based on over 110 reviews.
https://www.amazon.com/Smiry-Wate...1&sr= 8-6 
5 Comments
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For the price, this is a no brainer.
Bought one very similar here last week or so and you get what you pay for.