... $24.95 including an imp001!
This is a great way to get started with Electric Imp, and actually just a great little environmental sensor too if you need one of those. It's really intended for people averse to soldering and breadboards - there's no breadboard pins like an April.
Power is via USB (5v max) or 3xAA cells. You can get down to about 50uA with the imp sleeping (waking up on RTC) with all the sensors shut down, so you can get years of battery life.
It's got a temperature & humidity sensor, an air pressure sensor, and a 3-axis accelerometer. It can wake from these too, if needed. For output, there's a single WS2812 RGB LED, plus pads to daisychain more if needed.
Lastly, it's got 4 grove headers: 2x I2C headers (3.3v power) and 2x generic IO headers (3.3v switched power); there are various nice things that can sit on I2C (eg displays) and the generic headers have one I/O each, which can be analog or digital and can be used to add buttons or relays etc.@smittytone
has expanded our getting started guide to walk through some simple control & sensing projects - get started here: https://www.electricimp.com/docs/gettingstarted/explorer/blinkup/