You can buy online, many companies sell subwoofers.
in fact , some subwoofer with amp. you don't need buy amp. give you one good guide http://www.12vcity.com
Depending on the subwoofer you buy, Best Buy usually doesn't charge installation fees if you buy from them. Just check with the store and they will usually offer you a deal.
One can typically expect to pay at least $200 for a good quality powered subwoofer.
You must first check with the guide to your subwoofer. Either you can probably find it online , but you need to know the RMS wattage for the subwoofer. Than buy an amp that can put out the same number of watts and the RMS is for the subwoofer.
A good first car could be a Toyota or a Nissan,depends on what you can buy
the Alpine SPS-609 is a set of speakers each with a woofer and tweeter.You have to buy a subwoofer separately.
Kicker solo is a great all around subwoofer for the price. Good deep bass low price who could beat that?
One can purchase a Kicker subwoofer at many electronics retail stores such as Best Buy, Future Shop and Visions Electronic. One can also buy them at online shopping sites.
Yes, if it's a passive subwoofer, you might need to replace the amplifier for a new one as well. Too much or weak power outage is no good.
You can usually place your subwoofer just about anywhere in your home theater room, with good results.
Using 4 smaller speakers and no subwoofer is the cheapest option, but this system would not provide a lot of bass. If it's bass you want, then purchasing a subwoofer is the best quality option.