Novelty Poly-Pro Plastic Indoor/Outdoor Liner/Planter Flower Box, White 18 inch - Walmart.com
Amazon.com: Plastic Liners for Wood Boxes (11”x 4” x 3.5”) Clear Plastic Liners for Planters l Plastic Liner Inserts for Planters (Sell in Pack of 12) (to fit12 Planter) (L120404) : Patio,