To estimate the price of the 2014 Toyota Innova I4 2.7L Standard with 300000 km mileage, I first considered the selling price of a similar car: a 2014 Toyota Innova I4 2.7L Standard with 212000 km sold for SAR 35000 on 2023-10-04. Given the higher mileage of the target car, I adjusted the price downwards. Next, I looked at listed prices: a 2013 model with similar mileage is listed for SAR 29000, and a 2015 model with higher mileage is listed for SAR 26500. Considering the target car's year and mileage, I estimated a price slightly lower than the 2013 model's listing but higher than the 2015 model's listing. Factoring in the average condition and the market trend, I arrived at a final estimate.