There are a couple of things that you need to know about before you purchase a radar detection unit. First, the sensitivity of the the signals the unit emits is very important. A radar detector should be able to detect all the signals in the air but could dispose of as many false signals as possible. Signal detection range is another good consideration. The bigger the range, the better chances the driver has to react and avoid getting caught. In this regard go with the branded better quality ones. As a rule of thumb in this area, the better the quality of the radar detector unit, the broader the range.

Next thing to think about is how much are you willing to let go to buy a radar detector unit. You need to set a budget and get only a detector that you can afford. If you find the full featured ones as more expensive, move down the ladder step by step until you reach an acceptable price.

After considering the proper unit, brand, model, etc, the next step is actually purchasing the units. When looking a radar detector, your local car electronics shop would be your best bet. If you don't find anything on your nearby store, get the yellow pages and search under car electronics like stereos and alarms. More often than not, car radar detectors would be available in these shops.

The third option would be purchasing the unit online. There are lots of great and detailed info about various brands and models of radar detectors. Actually, all things considered, the internet is a cheaper source of radar detectors than in buying them direct from a car electronic shop. You just have to contend with the usual possible problems that could arise from the courier delivery systems. But aside from that the net is a large marketplace for radar detectors.

It is normal to find radar detectors at $80 dollars while more expensive ones, which can be more sophisticated and complex than other regular ones could reach more than $1000 per detector. However, some $1000 radar detectors are not better than their $80 counter part. Manufacturers just added a number of other features that they assume would be useful for motorists. This is why testing and reading more about radar detector products is very essential.

You can find almost anything on Ebay and chances are there are radar detectors for sale on it. Other popular sites include BestRadarDetectors.net and eTronics.com.