First 1:8 car

Got me the P1 for Christmas, as I wanted to return to building legos (been a couple of years since the last build). Had so much fun and the end result looks amazing and it’s very cool, the doors system and the 7 speed gearbox is super interesting. Now I want to get the rest of the supercars, anyone has some recommendations where to get the GT3 or the Sian from? I’m from Spain, I know they are discontinued, so they are a lot harder to find, especially the GT3, so any recommendation would be...