For the past couple year my team has used the TI Launch Pad.
First of all they do an awesome job documenting how to use them here
http://processors.wiki.ti.com/index....cs_Competition
secondly, they are available for free through FIRSTchoice or if you need to buy them they are only $13
https://store.ti.com/msp-exp430f5529lp.aspx
We have had better luck with these than the other options that we tried (the cypress psoc 4, and arduino mega).
Greg