This module lets you activate/deactivate special prices to a grid of category products.

Upload the files to the root of your Magento install. Let the install script run. A new attribute 'special_price_apply' and table 'aydus_specialpriceapply' will be installed. In the category admin, a new tab 'Category Special Prices' will show up to the right of 'Category Products.' Here you can have the special price apply to a number of products simultaneously. In the product edit admin, you can individually apply the special price to a product.