Where's the cheapest place to buy spray foam?

Cheapest place to buy spray foam depends on type, small DIY kits versus large contractor drums, but generally cheapest places include Home Depot, Lowes, Amazon, and local building supply stores for DIY kits, and wholesale suppliers for contractor quantities, similar to finding cheapest Packout deals. For small projects, cheapest is often Home Depot or Lowes for Froth-Pak or Touch n Foam DIY kits, with prices around $300 to $500 for 200 board foot kit, and Amazon often competitive with free shipping for small cans like Great Stuff for gaps. For larger projects, cheapest per board foot is buying from local insulation supply distributors or online wholesale like Spray Foam Systems or IDI Distributors for 55 gallon drum sets, where closed-cell set costs $2,500 to $3,500 but yields more. For cheapest small cans for sealing gaps, dollar stores or Walmart have Great Stuff for $5 to $8 per can. So cheapest place to buy spray foam for DIY small jobs is Home Depot, Lowes, or Amazon for kits and cans, while for large jobs cheapest is wholesale insulation suppliers buying drum sets, with prices varying by region and sales, so compare per board foot cost to find cheapest for your project size.