For anything that needs to be bought, Amazon has it. You can also find other stores that may have it cheaper but on Amazon you can have customers selling the audio set you need for cheap. Local car stores may be a help in finding exactly what you need.
I just got subwoofers for my car, I went to garage that fits car stereos and asked the owner for advice. He explained all the options to me, bought them for me and installed them.
Yes, most cars come with extremely basic factory installed stereos with radio capability. Factory installed car stereos have changed over the year. The quality and features of the car stereos differs between manufacturers.
Cheap car stereos typically have very low bass and lack the "bump and thump" of more expensive car stereos. You can purchase nice car stereos online from websites such as Amazon, Best Buy and Walmart.
Goodmans was created in 1917.
clairon
Goodmans Industries was created in 1932.
The users reviews of Kenwood branded car stereos have been very good. Most of the reviews state that the sound on the stereos is of good quality, it has many features and is easy to install.
Truly, the best car stereos have clear, non-muddy bass, and crisp treble. Ask your car stereo dealer what he thinks, and he will usually give you an honest opinion.
Walmart probably has some of the cheapest prices on car stereos but price doesn't translate to quality. Crutchfield has some amazing deals on car audio equipment.
Craig's List or Ebay
The plural form of Goodman is Goodmans, e.g.All the Goodmans were invited to the wedding.
There are many different brands of car stereos. Some of the more popular brands include: Pioneer, Boss, JVC, Kenwood, Alpine, Sony, Fusion and Clarion.