My advice is to put that money towards a drone with longer stock range.
I put a range extender on my P3 Standard and got an extra mile BUT you have to keep the controller pointed exactly at the drone to get that distance. Any slight movement with the controller will affect your signal strength. Took all the fun out flying that extra distance.
I sold the P3 Std and bought a Drone that has a range of 3 miles right out of the box. This drone is so much more fun to fly.
FYI - if you’re set on a range extender I used the 4hawks brand and installed it myself. I posted my install pics if you do a search.