I can work with arduino interfacing with components. For that, we would be needing at least a GSM module or a GPRS module, long range sensors for obstacle detection and many more. If we know what features we require, hardware requirements could be known easily. I could also help with the designing aspect and also in making the drone from scratch.
If we are to buy a drone and build from it, then the cost of the drone alone would spike our prototype cost, but then it would be easier for us to work with. I say, lets build it from scratch. Our own body, own design and materials. We could use a good flight controller if necessary.