New reduced price for the Axon Mote, just in time for the holidays!
The Axon Mote is like a mini-Axon, but with a micro-wireless transmitter and uSD built right in. You can program it within minutes using WebbotLib.
$54 for a single, or $108 for a dual mote kit which includes a free USB cable:
http://www.societyofrobots.com/axon_mote/