Arduino bluetooth enquiry

Hey there,
I'm undertaking a project where I am using a bunch of Arduino unos as mini controllers and an Arduino mega as a main controller for all my unos. I want to be able to communicate the Arduino unos with my main Arduino mega via bluetooth and was just wondering how people would go about this?

I'm fine with the coding side of things just looking for the conceptual idea of connecting the two via bluetooth. Like is there a specific (reliable) device people purchase? Any help would be greatly appreciated. Thanks :slight_smile:

regards,
Rob

Nobody will ever know what a bunch is but, if it is more than four, it is probably simpler to use something like a NRF24 network. They are a similar price and range, and probably more appropriate for the job.