CableMonsta Direct via Amazon has 2-Pack Cat 6 Ethernet Cable 10ft (Black and White) on sale for $4.37 with code N3FOJN8C.
Also, they have Cat 6 Ethernet Cable Black 100ft on sale for $9.97 with code EKAO7VAX.
Cat 6 Ethernet Cable 50ft on sale for $6.90 with code 67CGQ001.