Saan magandang bumili ng sandbags? Hindi pa ako nakakakita pero does it come in a bag that's durable enough when exposed to the elements 24/7?

May nakikita ako sa Youtube na water-activated sandbags and I think may mga binebenta sa Shopee/Lazada. Has anyone tried that?

And how effective are sandbags against a waist-high flooded street really? I just want to keep flood water from entering our front door the next time Ulysses-level rains come.