Koenigsegg will sell you a 1:6 scale model of the One:1's engine for $2500
Pretty good deal for 1:1000th the cost of a real one.
The Koenigsegg One:1 was the world's first megacar. Built on the Agera platform, the power-to-weight ratio of the One:1 was 1,360 PS to 1360 kg giving the car 1 PS per 1 kg mass. The 1,360 PS power output is the equivalent of one megawatt hence its name.
Koenigsegg built six customer cars that were all sold along with a development car, so they are all since gone but fear not Koenigsegg has a way for you to get a taste of the One:1's beauty.
On the Koenigsegg official store, Koenigsegg will sell you a 1:6 scale model of the 5.0 L twin-turbocharged V8 that powers the One:1 producing that 1,360 PS (1,341 hp) for $2499. It isn't a bad deal since a One:1 should cost somewhere in the $2.5 to 5 million range, so at mimium it is 1:1000th the cost of the real thing.
The item listing says: "This 1:6 scale replica is a handcrafted collector’s model made from resin. Delivered on a display stand with transparent plexiglass and certificate. Limited to 999 units."
I know, I know $2500 is still a lot of money, but you can also get a 1:43th scale of the actual car for a mere $149.