I'm still considering both a TX and RX built you do raise good points... I'm looking at a few kits and they seem to be about $10 which is not bad. I'm debating between buying kits or building kits, I'd like to make this as cheap as possible with components I can find here at RIT for free from a variety of sources... It's a simple design and one that the club could produce it's own boards, Im sure this is usually more expensive but I wonder if in this case it wouldn't.
Building the receiver for more interested students seems like a more viable option the more I am looking at this.
I am looking at this website at the moment.
The two transistor stage transmitter is the way to go. The single transistor ones arent very sensitive audio wise.