You never know when you might need a network cable (or when you might want to sell one on eBay!).
Newegg.com has this Rosewill 10 Ft. Networking Cable with FREE Shipping through 10/10/17.
Regular price is $15.99 less instant savings of $5.99 and a $10 mail in rebate, making it FREE
Print FREE After Rebate form from product page