by gregbast1994 on WordPress.org
Allows the author to provide a product or variation a custom backorder message. This is useful when you've got a hot item but no stock until Jan …

This is a simple plugin which adds a “backorder message” field to the Edit Product page.
The field is located in two spots – depending on the product type.
Usage is easy – there is no configuration just added fields to your simple and variation products.