To estimate the price of the 2018 Lexus IS300 I4 2.0L Turbo Charged Premier, I first considered the new car prices for the 2025 models, which start at SAR 194500 for the Elegant variant and SAR 218500 for the Excellence variant. The Premier trim is likely priced higher than the Excellence trim, but we don't have the exact new price. Next, I looked at the offer accepted for a 2020 Lexus IS300 Excellence with 32000 km at SAR 115000. This car is newer and has much lower mileage than the 2018 model. Considering depreciation, the 2018 model would be valued significantly lower. The listed prices for similar 2020 models are SAR 111000 and SAR 120000, which are also newer and have lower mileage. Given the 2018 model's age, higher mileage, and average condition, I estimate its market price to be significantly lower than these 2020 models.