Originally Posted by cstratton
The 2.4 GHz circuitry is usually a pair of chips from cypress that you or I can buy in single unit quantities from a distributor for less than $5 a piece - I'm sure they get better rates, or they could be using some newer chip (there is for example apparently a 2.4GHz chip specifically for guitar hero devices). Transmitters intended for more than indoor use would have a power amplifier chip adding a tiny bit more to the cost, but I think the real cost would be in the stick mechanisms and all that...
If someone gets one or sees one, it would be interesting to find out the FCC ID and look it up online...
Not only Cypress chipsets but also Nordic's 2.4G chipset nrf2401 . Many 2.4G TX and RX use it.