Malone Standard Kayak Foam Block Kit, MPG155 at Tractor Supply Co.
Middleboro Trailer Sales - These solid styrofoam blocks are 19”x12”x12” and were used to separate trailers on stacked loads. We're selling them for .50 each. They can also be used for flotation
Touch 'n Foam 12 oz. MaxFill Polyurethane Foam Sealant at Tractor Supply Co.
Rubbabu Rubbablox Natural Rubber Foam Blocks for Building Set, RBB-20290 at Tractor Supply Co.