How to order product for key exists?

The meta_key parameter tells WP_Query to only return posts that have the price_sale_custom meta data. Remove that first, and then change orderby to reference the meta_query values:

This is something that WordPress added support for in 4.2: https://make.wordpress.org/core/2015/03/30/query-improvements-in-wp-4-2-orderby-and-meta_query/

https://stackoverflow.com/questions/17745334/how-to-order-by-multiple-meta-keys

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