I would search Google for a list of local compaines who provide this service and then call to see if they sell items on consignment. In order to sell them, you also may want to consider using an online service such as Ebay or Craigslist.
Emerson is a popular brand that makes stereos. It simply means that it is a stereo made by emerson. It has no other possible meaning. You can find an emerson stereo at your local electronics store.
Project One stereos were an inexpensive stereo system and if memory servies me correctly, I believe they were made by Akai.
There are a wide variety of dealers, from national chains to whole in the wall stores that look like they sell stolen merchandise. The better business bureau can steer you right at http://www.bbb.org/central-california/accredited-business-directory/audio-visual-equipment-dealers
The apple store, online and off, have deals on iPod stereo's. Roger's Stereo, Amazon, Best Buy, Geek, and also Sears website's have deals on iPod stereos.
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.
If you want the original stereo this will be hard to find. If you want a new one, you can buy any aftermarket model that fits the opening (referred to as single and double DIN based on size of the stereo). Several online stereo dealers include all the mounting hardware and cable adapters at no charge (sorry I cant include names, it can be mistaken for an endorsement and the moderator will delete my post) just search for car stereos and you will find several online dealers available that can actually tell you what stereos will fit in your specific car. On a side note, for not much more cost than a basic model, you can get a unit with built in bluetooth that will give you hands-free phone and access to your iPod/MP3 player music library in your vehicle.
The best place to find information about stereo equipment installation is at Howto.com. This will give you step by step instructions on doing so yourself.
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.
The best place to find a bluetooth equipped stereo for your car would Best Buy's online website. This is the best place place because you are able to look at many choices and decide which stereo is right for you and your car.
You can find the dealers who sell or repair Acme screw machine equipment at pridemachinery.com. Just go to the website and type in your zip code.
You can find out which stereos are compatible with an edge subwoofer on crutchfield.com/S-yHDdnz5d860/carsystems/Ford-Edge-Stereos-and-Speakers.html
Wireless stereos are sold at most electronic stores including Best Buy and Radio Shack, as well as online retailers such as Amazon and Newegg. Many video game outlets also carry wireless stereos as these devices are frequently used for gaming.