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 (
    73433, 73432, 73431, 73430, 73429, 73428, 
    73427, 73426, 73425, 73424, 73423, 
    73422, 73421, 73420, 73419, 73418, 
    73417, 73416, 73415, 73414, 73413, 
    73412, 73411, 73410, 73409
  ) 
  AND cscart_product_prices.lower_limit = 1 
  AND cscart_product_prices.usergroup_id IN (0, 1) 
GROUP BY 
  cscart_product_prices.product_id