Barrels for Floating Docks
Barrels for floating docks are easy to find. Just search Craig’s List for “55 gallon drums” or “55 gallon barrels”.
Good, clean, reconditioned barrels are available in most areas for $10 to $25 each. At $20 each, putting 12 barrels under a 20×8’ dock adds $1.50/sq foot to the cost of your dock.
Another method is to find a food processor in your area. Most of them transport their raw materials in these barrels. If you can find a company that receives product in these barrels they will most likely give them to you for free.