R-22 Refill for Mitsubishi AC

My older-style Mitsubishi Mr Slim PKH-2GKLA in Redfern isn’t cooling the way it used to. The outdoor unit pipework had a refrigerant leak that has already been repaired, so I now just need the system re-charged with R-22 to bring it back to spec... (Budget: $250 - $750 AUD, Jobs: Air Conditioning, HVAC)