Ebay offers Insignia- 50' Cat-6 Ethernet Cable - Gray for $7.99 (reg. $37.99) free shipping with Amazon Prime. 

Product Description:
Easily connect most Ethernet-enabled devices, such as a PC or Mac computer, to your 10/100/1000 Ethernet network using this 50' Insignia Cat-6 network cable that features gold-plated RJ-45 8P-to-8C connectors for optimal signal strength.