DionR - I searched Ebay for wiring suppliers and purchased from two sources. 20' of 1/0 cable through
acdcelectricparts for $53 (free shipping) and 25' each of red and black 4awg cable from
temco_industrial_power for $53 + 5 for shipping. That was plenty of wire length to do the car front to back. Had an issue with temco's shipping as they coiled the wire up in a tight roll and stuffed it in a shipping bag. The outer coils of wire got quite beat up from the lack of protection. They offered to replace it. If ordering from them I would get assurance that they would box it first.