I've started buying low end Au beef and making my own ground beef. It's pricey at 300thb for 500g, but after you brown the meat for tacos there's no juice or fat in the pan. I'll never buy minced beef again, The little processor I use cost like 400thb and is just right for a pound.
I use the small wheat tortillas at Makro, grill with butter. Great tacos.