This Sony a9, which appears to be one of the most impressive cameras ever built, is now available for preorder at BH. If you want one of these when it's released on May 25th, you may want to preorder today.
The Sony a9 certainly isn't cheap at $4500 but when you compare it to the competition, it's actually quite affordable. The Nikon D5 is $6500 and the Canon 1D X Mark II is $6000. Cameras at this price point usually do not sellout as quickly as consumer and "prosumer" level cameras but I'm not sure I've ever seen more excitement for a camera before and therefore I'm expecting it to sell out.