There was talk of an RF based system.

That to me makes too much sense.

The drawback from what ive heard is that it need to be closer, or have a higher powered signal to be more effective. The ones i have heard about working have a narrow band and limited range.

If someone could do more R & D on an RF system, It would save tons.

You could basically get a sticker pack of 100 for like $10-20... It wouldnt need any power at all (no wires, yay!?) and it would weigh near nothing.