I hired a company to perform lawn fertilization/weed control. After their first visit, they wrote in the notes that I need grub control (haven't really seen any grub myself), which of course is charged extra. Whether I really need it or not, I'm trying to figure out the cost involved if I were to do it by myself. The yard is about 4k sq ft. They want about $70 for the service. I looked briefly on line. Found some substance called Milky Spore, but it costs more than what the lawn company would charge. So, is there some low-cost effective grub control substance that you can recommend, or should I just pay the lawncare company to do it, assuming I do need it?