You'll have to get a minimum of two, and I have no idea the cost. This exact item from Shenzhen Kyl Communication is on several China trade websites, with no price info. Maybe it's on eBay.
From tootoo. Com: FSK/GFSK Low Cost Wireless Transceiver Module For Short Ranges Communication Supply Ability: 50000pcs/month Minimum Order: 2 pcs Lead Time: 1-6 days Model: KYL-210 Brand Name: KYL Origin: China FSK/GFSK Low Cost Wireless Transceiver Module for Short Ranges Communication Good quality RF module, One year Guarantee/Warranty RF radio modem, RS232/RS485/TTL/USB RF modem Product Description small size, low power Data Sheet: o RF power: less or equal to 50mW o Operating voltage: DC5. 5V or 3.1V o Receive current: less than 20mA o Transmitting current: less than 40mA o Sleep current: less than 20uA o Carrier frequency: 433MHz, also can customize 300 to 350 MHz, 390 to 460MHz and 780 to 925 MHz or ISM others o Communication connects: RS-232/RS-485/USB/TTL selectable o Baud rate: 1200/2400/4800/9600/19200/38400/100kbps o RF line-of-sight Range: 200m (BER = 10-5 at 9600bps) 400m (BER = 10-5 at 1200bps) o Size: 40 x 24 x 6mm(without antenna port)" From easychinasupply.Com (there's a link on that page to send a note to the manufacturer) "Data Sheet: RF power: 10mW Operating voltage: 5 V Receive current.
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