Yes, it depends on what kind of sensors you get. I meant just with GPS, 4 BLHeli ESCs will run you around $40, 4 motors another $40, Kakute F7 controller another $50, $30 for the frame, $8 for the GPS, $10 for the receiver, $5 if you want an extra PDB, it's not that bad.

If you add sensors it does add up though, you're right.