the professional and industrial are at $4,052 and $4,471 respectively. they are probably the ones with 640x512 resolution - although I don't understand directly what the difference is. All those listings include the cheapest lens option, being 4.9mm... which should result in different fov due to the crop factor of different resolutions.
the pictured 6.5mm/f1.0 option is not in the list.
oem cameras has a no lens verion of the low resolution one for just $1,449:
http://www.oemcameras.com/flir-boson-320x256-no-lens.htmhere the 73mm lens:
It is a very nice new core - and has a lot of potential with the offered boards for computer vision - but the 9hz version is really a bummer and 60hz makes it 7 times better.