there is ott guage and 0 guage i think. not for sure on that but i say that online some place.
this best wire i have found is this.http://cgi.ebay.com/KnuKonceptz-Ultra-Fleks-1-0-Power-Wire-0-Gauge-Black_W0QQitemZ220326164870QQihZ012QQcategoryZ32810QQcmdZViewItemQQ_trksidZp1742.m153.l1262
you want something that is 100% tinned copper.
a lot of the cheaper wire is mostly made of aluminum other than copper.
knukonceptz also has some that is 1.75 a foot but it has a lot of aluminum
i have some extra memphis ott that is very good. it is also 100% tinned copper and looks almost the same as the knukoncepz. i am selling it for 2.50 a foot cause i have extra but i will prolly have it sold by the time u message me... if u wanted any