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The transmitter/receiver boxes were developed when the FCC opened up the 900MHz band for low-powered devices such as cordless phones, etc. There was enough spectrum in that band to transmit a 6MHz TV signal, so manufacturers took advantage of that by making the transmitter/reciever boxes. A regular TV could not recieve a signal on 900MHz, so that's why the receiver box was paired with the transmitter.
The FCC did allow low power audi devices in the FM radio band in the 90s, which allowed us to transmit CD players (now MP3 players) to an FM radio, but they have never (to my knowledge) opened up any part of the VHF or UHF TV bands to low power transmitters. The National Association of Broadcasters still opposes the FM band transmitters, and they were the ones to cry fowl recently on a few of Sirius Satellite Radio's receiver units which have built-in FM transmitters that were transmitting with too much power. The NAB's concern is that these devices will interfere with someone else's normal reception of an FM radio station, due to on-frequency, adjacent-frequency, or intermodulation interferance. The NAB would, in my opinion, will continue to fiercely lobby against any device which transmits in the UHF TV band due to interferance concerns.
So long story short, don't expect to see this at Best Buy anytime soon.