4pk?

[legobrains]

you can find them pretty frequently on ebay. A react with a receiver should be around 200-220 used...

Still alot cheaper then a futaba 4pk with some more features.

And they (react and sensor) can run spektrum receivers.

(Note - the sensor you must have a laptop computer to switch it from nomadio to spektrum. The react has enough on board memory to just switch back and forth. So no laptop need for the react.)