Well, the other day I was in CompUSA and sae the irOck Model 300W. It transmits on Frequency Modulation 88.1, 88.3, 88.5 or 88.7. This range is helpful inasmuch as some communities may have stations on one or more of these frequencies.
In my opinion, this is an excellent product. On occasion I've had to change the station because of signals from broadcast station using the frequency. The sound quality is excellent. I'm a lover of reggae music -- it does much justice to that and other genres.
Apparently I'm not alone in my opinion. Note this
review in mobilemag.com. You can also visit the manufacturer at
myirock.com.
One more thing: I was able to put this transmitter in the back seat of my Nissan Maxima and have my son play is Gameboy sounds through the system. It still worked flawlessly. It did not have to be near the radio to get a great signal.
CompuUSA sold it for $29.