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Walmart has Rubbermaid Easy Find Vented Lids Food Storage Containers, Set of 19 (38 Pieces Total) Plastic Containers|Reusable & Stackable Meal Prep Containers, Racer Red for $ 1.50 YMMV.
Rubbermaid Food Storage Containers, Set of 19 (38 Pieces Total) $1.50 @Walmart YMMV