Spotted this on Very.co.uk at a fairly decent price. It does state that its a 500GB model with Battlefield 1, however from what I know already Microsoft are only releasing a 1TB version - http://www.xbox.com/en-GB/
If you notice on the advertisement, the colour can only be selected as Black (meaning Military green in this case) so you could be onto a winner.
There is a downside, its only to be released on October 13th, so you may have to wait a bit for it.
If there is anything I have missed then please let me know.