Monoprice Cat5e Ethernet Patch Cable 100ft @ 6.25 / 50ft & 75ft @ 3.98 / Snagless RJ45 350Mhz UTP 24AWG 50 75 100 Feet Black $6.25

This deal has been popular in the past. 100ft is available for $6.25 again, but delivery will take ~1-2 months. 50ft / 75ft are available now for $3.98. Free s/h with Prime.
Note: this is for a heavy duty (24AWG) Category 5e, and is for gigabit speeds, and not for 10 gigabit networks.
https://www.amazon.com/gp/aw/d/B0…th=1&psc=1