T-FHSS receivers

[lofty2332]

When using a Futaba T4GRS transmitter do you have to use Futaba branded receivers like the Futaba R304SB-E or can you use an alternative 3rd party receivers? and if 3rd party receivers can be used can anyone recommend one?

I have a couple of cars that I don't use very often so spending £50 on a receiver for them seems a little excessive if there are cheaper alternatives.