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 (
    67257, 67256, 66534, 67158, 67208, 67196, 
    67195, 66979, 66878, 66812, 66787, 
    66527, 65967, 66881, 67016, 67014, 
    66981, 66980, 66784, 66622, 66621, 
    66393, 61786, 66986, 66985, 66978, 
    66846, 66843, 66842, 66783, 66780, 
    66286, 66283, 66214, 66779, 65966, 
    66533, 66729, 66594, 66287
  ) 
  AND cscart_product_prices.lower_limit = 1 
  AND cscart_product_prices.usergroup_id IN (0, 1) 
GROUP BY 
  cscart_product_prices.product_id