ORIGINAL: the-plumber
I didn't list any of the 'other' frequencies because transmitters and receivers which operate in the 27 MHz band are few and far between.
If you believe that 27mhz equipment is not widely available and in use, I think you might be surprised? [

] Let me help you out. It would not surprise me if there are more 27 mhz radios sold than 72 mhz radios every year.
But if you would like components, here are some available options:
ParkZone receiver
http://www.horizonhobby.com/Shop/ByC...ProdID=PKZ1252
ParkZone Radio
http://www.horizonhobby.com/Shop/ByC...ProdID=PKZ1246
HobbyZone Radio
http://www.horizonhobby.com/Shop/ByC...ProdID=HBZ3555
HobbyZone receiver
http://www.horizonhobby.com/Shop/ByC...rodID=HBZ78302
the big radio makers have plenty fo 27 mhz equipment for you.
Here is a nice Futaba 27 mhz system for you.
http://www2.towerhobbies.com/cgi-bin...=LXBCP2**&P=ML
Additional 27 mhz Frequency packs
http://www2.towerhobbies.com/cgi-bin...I=LXCSW6**&P=7
Or you can get the Futaba 27 mhz frequency Synth Module
http://www2.towerhobbies.com/cgi-bin...?&I=LXHKB2&P=7
Airtroncis Synth module
http://www2.towerhobbies.com/cgi-bin...?&I=LXGRF2&P=7
Airtronics 27 mhz 8 channel reciever
http://www2.towerhobbies.com/cgi-bin...I=LX0784**&P=7
Hitec 27 mhz
http://www2.towerhobbies.com/cgi-bin...?&I=LXN521&P=7
Radio system
http://www.horizonhobby.com/Shop/ByC...odID=HRC135271
JR 27 mhz synth receiver
http://www.horizonhobby.com/Shop/ByC...dID=JRPRS30027
Megatech 27 mhz radio sysetm
http://www.horizonhobby.com/Shop/ByC...odID=MTC732027
If you think that 27 mhz equipment is not readily availabe, guess again!