Are you doing your own installation or just need to add a component? Area-41 has a complete line of Stinger accessories.  Here are just a few of the items that we stock:

Power and speaker wire
Interconnects
Fuses
Gold and platinum terminals
Capacitors with digital voltage meters
Complete line of Dynamat sound proofing
Stinger and Optima Batteries
Alternators
Peripheral OEM interface adaptors