Your search for "plastic pallet" revealed the following:

Plastic pallet (green) : YSK Unpainted kit N (1:150) Part No. 467

Plastic pallet (red) : YSK Unpainted kit N (1:150) Part No. 466

Plastic pallet (blue) : YSK Unpainted kit N (1:150) Part No. 465

Plastic pallet (gray) : YSK Unpainted kit N (1:150) Part No. 468

Wooden pallet (small) brown : YSK Unpainted kit N(1:150) Part No.464

Wooden pallet (large) light brown : YSK Unpainted kit N(1:150) Part No.461

Cargo sets (kegs, crates, beer cases, pallets, wire rolls): Busch kit HO (1:87) 1132

Wooden pallet (large) brown : YSK Unpainted kit N (1:150) Part No.462

Cargo: Preiser unpainted kit, 1:22.5 scale, 45200

Wooden pallet (small) light brown : YSK Unpainted kit N(1:150) Part No.463

Loading cardboard (small) : YSK unpainted kit N (1:150) Part No. 469

Loading cardboard (large) : YSK Unpainted kit N (1:150) Part No. 470

Pallet, slatted board, small box: Woodland, painted and ready to assemble N (1:160) 2161

Luggage Set (6 pieces) : Woodland Finished product set O(1:48) A2766

Pallet Rack : Prizer Unpainted Kit HO (1:87) 17125

Warehouse Pallets and Loads : Preiser - Painted HO (1:87) 17704

Cardboard box (loose) : YSK Unpainted kit N (1:150) Part No. 471

Cargo set (crates, barrels, bottles, etc.): Preiser unpainted kit HO (1:87) 17100

Cable drum and transport rack: Preiser unpainted kit HO(1:87) 17117

Lifters and pallets: Preiser, complete painted HO (1:87) 17712