Cablemonsta has a 40% off coupon off their white 50′ ethernet cable. Under the price there’s a link that says "buy 1, get 40% off". Put your mouse over the link and click "redeem" at the bottom of the popup box for the coupon. Coupon is only good for one use but you can buy a few in one purchase (I bought 2 for $12).
https://www.amazon.com/Ethernet-H…rnet+cable
Edit: 100ft cable is $10 (after a 38% coupon)
https://www.amazon.com/Ethernet-H…t+ethernet
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