I have been getting this checked out as I'm aware this was raised as a known issue previously. I am able to order series one from here ok in the office, if it's still not working your end then I will add this to a ticket I have raised to our fault teams to check out.
Can you please confirm if you are still unable to order series 1 of Falling skies please?
I look forward to hearing from you
Tech fan? Have you read our Digital life blog yet? Check it out