: Home Depot and Lowe’s sell oversized moving boxes that can be flattened into large sheets. They also sometimes stock "contractor-grade" cardboard rolls or sheets for floor protection.
If appearance is less critical, you can find massive pieces of cardboard—often from refrigerator or furniture boxes—at these locations: where to buy big pieces of cardboard
Finding large pieces of cardboard depends on whether you need "pristine" sheets for a professional project or just bulky material for gardening, crafts, or moving. You can buy them from major retailers like Home Depot or Staples , or source them for free from appliance stores and recycling centers. Where to Buy Large Cardboard Sheets : Home Depot and Lowe’s sell oversized moving
If you need high-quality, uncreased cardboard, these retailers offer dedicated sheets: You can buy them from major retailers like
: Sites like Amazon and Uline offer the widest variety of sizes, including extra-large corrugated sheets (up to 48" x 96").