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$10
New, never used. Pick up on campus.
Cartman Booster Cable 4 Gauge x 20Ft in Carry Bag (4AWG x 20Ft) for $12. Comes with brush and gloves.
Price on Amazon is $20. (Link: https://www.amazon.com/CARTMAN-Booster-Cable-Gauge-UL-Listed/dp/B00F9RNIPI/ref=sr_1_3?ie=UTF8&qid=1534010400&sr=8-3&keywords=cartman+booster+cable+4+gauge+x+20ft)
Please do not message this poster about other commercial services.