The Galaxy S9 is a fine phone, but it just launched and its price hasn't had time to cool off. The Galaxy S8 is a different story. It's price in the UK is under £500, compared to £740 for the S9. You can find a new unit from Amazon for £475 or from Alternate for £490. It's the G950F model with Exynos 8895 (single SIM). Samsung Galaxy S8 G950F You can go lower than that by getting a seller-refurbished unit from eBay. A Vodafone unit in Pristine condition is £430, the unlocked one is £470, so not really worth it. Note that this is for the Black model, other colors cost more....
Source: https://www.gsmarena.com/deals_samsung_galaxy_s8_for__pound475_new_pound360_for_a_refurbished_unit-news-30106.php
