: While a brand name, large 3lb bags often retail for around $5.87.

For the best value, the cheapest places to buy Epsom salt (magnesium sulfate) are like Walmart and agricultural supply stores for industrial-sized needs. While specialized bath boutiques charge a premium, you can find prices as low as $0.05 – $0.08 per ounce by purchasing in bulk or using store brands. Top Retailers for Cheap Epsom Salt

While the unit price is low, the bag sizes are typically much smaller (1lb or less), which may not be the cheapest option for heavy users. : Best for extreme bulk (50lb bags).