Check out PartsExpress.com as well as Madisound.com You can get top quality speaker drivers from companies such as Vifa, SEAS, Scanspeak, Tangband, Dayton, Peerless and Dayton. As someone new to car audio, you may have never heard of these brands, but believe me, you will pay less for raw drivers and equal, if not better performance than all the highly marketed mass produced audio equipment you know of. Both of the companies offer excellent service and technical support. They don't offer head units, but pretty much anything else you need, you will find.