Low Cost RF trasmitter/receiver pair

Low Cost RF trasmitter/receiver pair I need an ultra low cost solution that will let me wirelessly transmit a 'wake-up' signal from one circuit (Master) to another circiut(Slave). The Master and Slave are separated by about 3m. The Master will contain the transmitter which will transmit the wake-up signal as required. The Slave will be in 'listen' mode. When it receives the wake-up signal, it will then generate a signal to its circuitry to perform its own actions. IMPORTANT The Slave must draw very little current (<10uA) when it is in listen mode. Deliverables Selection of components and schematics with total BOM cost (based on DigKey 1k quantites) for Transmitter and Receiver of less than $2, excluding pcb.