you can buy very good car speaker radios and an assortment of amps at Radio Shack. It depends on the type and brand of speakers you want. I recommend you stop at some other car parts store too.
Replacement audio speakers for a car can be bought at numerous locations. Good places to purchase them include car audio shops and car dealerships. Replacement speakers can also be purchased direct from manufacturers such as JVC, Pioneer, and Kicker.
They are one of the top speakers out there, The price is high too. So if you have the money i would say run out and buy a pair of Infinity speakers you won't be let down.
you need to buy and install an rf adaptor
Bose car speakers are actually surprisingly good, and much better than their home surround sound speakers.
You can purchase some good and cheap car speakers from Halfpriceaudio.com. You can also purchase good quality and cheap speakers from Kmart and caraudiodiscountplus.com.
online: crutchfield.com
Alpine car speakers are the best car speakers for those that are trying to stay in a budget. They are known to last long and are affordable.
JL audio are a very good line of speakers definitely recommended for any car
JL are good speakers.
Best Buy is a great place to buy tower speakers. They have a wide selection and great prices.
Speakers are the weakest link in any audio system. Always buy the BEST speakers you can afford. You won't be able to hear the difference in lower priced electronics but you will in lower priced speakers.
Why don't you buy them and find out