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 (
    66092, 66091, 66090, 66089, 66088, 66087, 
    66086, 66085, 66084, 66083, 66082, 
    66081, 66080, 66079, 66078, 66077, 
    66076, 66075, 66074, 66073, 66072, 
    66071, 66070, 66069, 66068, 66067, 
    66066, 66065, 66064, 66063
  ) 
  AND cscart_product_prices.lower_limit = 1 
  AND cscart_product_prices.usergroup_id IN (0, 1) 
GROUP BY 
  cscart_product_prices.product_id