Or you can go to a good feed store and buy a 50 pound sack of D E and Phyrethrum Powder and mix your own for a huge cost savings. Just don't go around throwing it around willy nilly or you'll wipe-out all your good bugs just treat the fire ant mounds.
D E is kind of mechanical so bugs can't get immune to it. I mix a small amount of food grade (not the swimming pool stuff) with animal feed for 3 days in a row a month during the warm months to prevent worms. A 1/8 teaspoon per cat, up that scale for dogs based on weight and a small handful for 4 middle sized goats, not sure about Phyrethrum but I don't think the bugs get immune to it either, just read the labels and follow instructions.
Thanks for the input.