I have moved house and have a THE EAGLE 12 NUSHKA alarm system fitted. I need to add 3 or 4 wireless PIR wireless motion sensors. Local alarm company has quoted me R650 each, is there anywhere where I can source these cheaper as I am on temporary incapacity leave and have to watch the expenses. Already spent R1000 to fix a roboguard that had battery acid ruin the bottom sensor board that had to be replaced.