are you needing small amounts or ROLLS? if small then i have some old stock, NEW in the package Monster Cable 10ga. amp kits, that include power, ground, and rca's, hell will do $10 each + shipping... hows that cheap for you... Heck the RCA's are worth that..
got rolls of 10ga. as well.. not sure what all brands, but prob.. monster, hooker, and street wires