List_TransmitterReceiverModules

China || Hong Kong

(takes a couple of days to deliver but is really cheap)

• AliExpress: search for "Arduino 433" or "RF Link kit
• eBay: search for "Arduino 433" or "RF Link kit"
• https://www.seeedstudio.com/item_detail.html?p_id=127

Germany

• http://www.watterott.com/de/RF-Link-2400bps-Empfaenger-434MHz
• http://www.watterott.com/de/RF-Link-Sender-434MHz
• http://www.conrad.de/ce/de/product/130428

Norway

• http://www.kjell.com/no/88901
• http://www.kjell.com/no/88905

Sweden

• http://www.kjell.com/se/88901
• http://www.kjell.com/se/88905
• http://www.electrokit.com/tx433n-sandarmodul-ask-433-9-mhz.45094
• http://www.electrokit.com/transceiver-433-92mhz-ask-data.48031

UK

• http://www.quasaruk.co.uk/acatalog/Radio_Modules.html

US

• Amazon: search for "Arduino 433" or "RF Link kit"
• ebay: search for "Arduino 433" or "RF Link kit"