High altitude supplies.
By UKHAS
http://ukhas.org.uk/general:suppliers
Python and GPS Tracking Tutorial
Bricktronics
Lego meets Arduino
Arduino motor shield
1 MHz crystal oscillator
A low powered radio transmitter.
Jameco part number: 27861
Linking an Arduino to a Radiometrix NTX2 Transmitter
http://ukhas.org.uk/guides:linkingarduinotontx2#where_to_buy_the_ntx2
For high altitude telemetry using RTTY.
Raspberry Pi Sends Live Images from Near Space
The crystal set of AM transmitters
audio transformer + crystal oscillator + battery = AM radio
At scitoys.com
http://scitoys.com/scitoys/scitoys/radio/am_transmitter.html
source of radio parts for this type of project:
http://www.scitoyscatalog.com/category/R.html
Radio Shack has audio transformers…
http://www.radioshack.com/product/index.jsp?productId=2103254
USB Relay Controller with 6-Channel I/O
Tinkerkit Arduino
A shield with a set of easy-to-connect sensors
A high voltage AC relay is available.