Adorama, B&H, Samys, and Amazon are among those now accepting pre-orders for what is shaping up to be the camera of the year:
https://www.bhphotovideo.com/c/product/1283336-REG/fujifilm_gfx_50s_medium_format.html
https://www.amazon.com/Fujifilm-GFX...=UTF8&qid=1484865352&sr=1-3&keywords=Fuji+GFX
https://www.samys.com/p/Fuji/6000182134/GFX-50S-Medium-Format-Mirrorless-Camera-Body/191490.html
https://www.cinema5d.com/medium-format-fujifilm-gfx-50s-video-camera/
https://www.bhphotovideo.com/c/product/1283336-REG/fujifilm_gfx_50s_medium_format.html
https://www.amazon.com/Fujifilm-GFX...=UTF8&qid=1484865352&sr=1-3&keywords=Fuji+GFX
https://www.samys.com/p/Fuji/6000182134/GFX-50S-Medium-Format-Mirrorless-Camera-Body/191490.html
https://www.cinema5d.com/medium-format-fujifilm-gfx-50s-video-camera/