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 (
    68835, 69400, 69349, 69324, 69291, 69257, 
    69256, 69255, 69123, 68831, 68697, 
    68696, 68879, 68906, 68576, 69176, 
    69175, 69174, 69033, 67842, 69173, 
    69172, 69100, 69099, 69032, 69022, 
    68905, 68408, 68368, 68367, 68695, 
    68547, 68555, 68904, 68903, 68834, 
    68833, 68725, 68605, 68292
  ) 
  AND cscart_product_prices.lower_limit = 1 
  AND cscart_product_prices.usergroup_id IN (0, 1) 
GROUP BY 
  cscart_product_prices.product_id