SELECT 
  cscart_product_prices.product_id, 
  MIN(
    IF(
      cscart_product_prices.percentage_discount = 0, 
      cscart_product_prices.price, 
      cscart_product_prices.price - (
        cscart_product_prices.price * cscart_product_prices.percentage_discount
      )/ 100
    )
  ) AS price 
FROM 
  cscart_product_prices 
WHERE 
  cscart_product_prices.product_id IN (
    67662, 67159, 67063, 67062, 67639, 67207, 
    67629, 67628, 67627, 67613, 67589, 
    67514, 66982, 66835, 66813, 65968, 
    67122, 66719, 67363, 67411, 67360, 
    66786, 66785, 66691, 61783, 67303, 
    67302, 67270, 67269, 67268, 67267, 
    67266, 67265, 67264, 67263, 67262, 
    67261, 67260, 67259, 67258
  ) 
  AND cscart_product_prices.lower_limit = 1 
  AND cscart_product_prices.usergroup_id IN (0, 1) 
GROUP BY 
  cscart_product_prices.product_id