The Home Depot does not carry leaf springs. Because leaf springs are automotive parts, and The Home Depot does not stock automotive parts, it is not possible to find them at any of the store's locations locally or online.
A vehicle's suspension system uses leaf springs to dampen the motion that occurs when the vehicle moves. While these devices are common in virtually every vehicle in production, they are strictly an automotive part. Stores that carry leaf springs include Advance Auto Parts and Auto Parts Warehouse. Both of these stores offer local and online purchase of leaf springs for a wide variety of vehicle makes and models.