From their announcement:
The Grafe’s Steel Legion has proven to be so popular that we have already sold out of all our pre-order sets.
However as the army deal is set to run until 12am (GMT) tonight we will still be honouring our offer. So anyone who orders before midnight tonight will still receive a Grafe’s Steel Legion set once we re-stock with the miniatures required.
So for all of you who still want to get your hands on this fantastic army deal don’t forget you need to order tonight.