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 (
    77577, 77576, 77575, 77574, 77573, 77572, 
    77571, 77570, 77569, 77568, 77567, 
    77566, 77565, 77564, 77563, 77562, 
    77561, 77560, 77559, 77558, 77557, 
    77556, 77555, 77554, 77553, 77552
  ) 
  AND cscart_product_prices.lower_limit = 1 
  AND cscart_product_prices.usergroup_id IN (0, 1) 
GROUP BY 
  cscart_product_prices.product_id