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 (
    65926, 65925, 65924, 65923, 65922, 65921, 
    65920, 65919, 65918, 65917, 65916, 
    65915, 65914, 65913, 65912, 65911, 
    65910, 65909, 65908, 65907, 65906, 
    65905, 65904, 65903, 65902, 65901, 
    65900, 65899, 65898, 65897
  ) 
  AND cscart_product_prices.lower_limit = 1 
  AND cscart_product_prices.usergroup_id IN (0, 1) 
GROUP BY 
  cscart_product_prices.product_id