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 (
    1127, 1132, 1136, 1137, 1138, 1143, 1144, 
    1145, 1146, 1128, 1130, 1133, 1139, 
    1134, 1140, 1141, 1147, 1148, 1149, 
    1142, 1150, 1151, 1152, 1153, 1129, 
    1154, 1135, 1131
  ) 
  AND cscart_product_prices.lower_limit = 1 
  AND cscart_product_prices.usergroup_id IN (0, 1) 
GROUP BY 
  cscart_product_prices.product_id