To estimate the price of the 2023 GMC Yukon V8 5.3L SLE (Base) with 30000 km mileage, I first looked at the selling prices of similar cars. The 2021 GMC Yukon V8 5.3L SLE (Base) with 21000 km sold for 183000 SAR in April 2024. Given that the car in question is a 2023 model, it should be valued higher. The 2022 GMC Yukon AT4 V8 5.3L with 38000 km sold for 237000 SAR in March 2024, but this is a higher trim. The listed prices for 2023 GMC Yukon V8 5.3L SLE (Base) range from 210000 to 234000 SAR, but these are not actual selling prices. Considering the car's average condition and the depreciation from the new car price, I estimate the market price to be slightly lower than the listed prices but higher than the 2021 model's selling price.