Wyomind Data Feed Manager conditional special price - this custom attribute for Wyomind Data Feed Manager only shows the special price when the special price is set lower than the original price.

ConditionalSpecialPrice.php

<?php
if($product->getSpecialPrice() && $product->getSpecialPrice() > 0 && $product->getSpecialPrice() < $product->getPrice()) {
  $specialPriceInclTax = Mage::helper('tax')->getPrice($product, $product->getSpecialPrice(), true);
  $conditionalSpecialPrice = '<g:sale_price>' . $specialPriceInclTax . '</g:sale_price>' . PHP_EOL;
  $specialFromDate = $product->getSpecialFromDate();
  $specialToDate = $product->getSpecialToDate();
  if($specialFromDate && !$specialToDate) {
    $specialToDate = '2100-01-01';
  }
  if($specialToDate && !$specialFromDate) {
    $specialFromDate = '1970-01-01';
  }
  if($specialFromDate && $specialToDate) {
    $specialFromDate = date('c', strtotime($specialFromDate));
    $specialToDate = date('c', strtotime($specialToDate));
    $conditionalSpecialPrice .= '<g:sale_price_effective_date>' . $specialFromDate . '/' . $specialToDate . '</g:sale_price_effective_date>';
  }
} else {
  $conditionalSpecialPrice = null;
}
return $conditionalSpecialPrice;