Looking for quality price drone communicating with MAVLink

Good morning,
I am looking for a new or used drone model communicating MAVLink equipped with GPS

I’m looking for quality / with gps

I am of a dedutant level but less in the devloppement

I searched for a long time on Google and I found it difficult.
chatGPT recommends a Phantom game by DJI
are you true?
for example is there a way to change the firmware of a Phantom 3 or be compatible?

thank you very much