Edit: I updated the tutorials link with a list of other links I've compiled. Also, it looks like they upped the board price to $9.99 ( http://www.ti.com/ww/en/launchpad/msp430_head.html ). It is absolutely worth it IMO. Good luck with your project!
You can just buy 1 LaunchPad and use it as a programmer to download code to your breadboard or custom PCB. You just need to hook up the TEST, RESET and GND lines. So you can use a cheaper board (and with more pins) like this https://analog10.com/store/BOB-G2553-28.html.
Thanks, that's some good info! I might prototype with Arduino as a proof of concept and see how far I can get with these TI boards if/when I put the project into "production".
