If you plan on running a system that needs a big 3 upgrade, it does not matter. Depending on the car and system, 20-30 dollars tops. What you are running determines the cost.
Well it depends, it's a big investment to buy 15 feet of wire, some ring terminals, a sheet of sandpaper, and a dildo to fuck yourself with after you lose your car because you spent your car payment buying Big 3 fixin's