As there's such a niche market for these cars many owners part ex their ISF's when it's time to move on. The dealers then add on a huge premium and are prepared to hold on and play the long game, in most cases. The best buys are private sales, with peace of mind of the Lexus warranty but these are rare to find. As soon as it's in the hands of the dealer, you can be sure of a 20%+ premium.