Seconding Bonds. At Woolies they’re sometimes on special, usually just next to the pads/tampons. The cheaper versions are synthetic polyester stuff which isn’t great in hot weather, makes my ass sweaty and rashy, so check what they’re made of - any lace ones are also not great and will fall apart. But anything that’s fabric blend is good for breathability and longevity. I can’t remember the other brand of fabric ones (maybe love luna?) I have but I also got them from Woolies.