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You can buy online 433mz transmitter and receivers for cheap, couple of dollars. These are useless unless you also buy the encoders/decoders to go with them, again a buck or so. The encoder I use is a PT2262-M4, the decoder I use is the PT2272-M4. This enc/dec can be hard wired to a specific address something like a garage door opener. So you can have one receiver and make it address switch selectable (dip switch, or by a micro-controller) to control multiple receivers which have there own address running at 433mz. They work from 3vdc to 15vdc.
there are units available with 100x higher power output too like rfm22b
i wish there was something I could do about it