Hi smallbobbins ,
As I told you in my last post, the purchase price is a product's data. It can change through time, so makes no sense to include it in order exporting (unless you copy the value when creating the order).
Sorry, but this is something that we haven't planned to add in the near future. However, feel free to include it as a suggested feature. If enough users request it, we'll consider adding it in future versions.
Best Regards,
José Andrés