How to add special price to Extended Product Grid?

Please open Extended Product Grid settings (Grid Attribute Columns) and enable the special price.

Special price grid column in magento

If this does not help, open file (if you have one)
app/code/community/Symmetrics/DeliveryTime/Block/Adminhtml/Catalog/Product/Grid.php and replace

extends Mage_Adminhtml_Block_Catalog_Product_Grid


extends Amasty_Pgrid_Block_Adminhtml_Catalog_Product_Grid
See more details on Extended Product Grid with Editor page
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