I don't know. BBC print runs for steels aren't usually that high. Doctor Who only had 2000 I think. Plus they've started limiting the stock per customer. It's down to 5 whilst last week you could could still order 10 per customer.
If you're interested in it, I would.
Zavvi didn't stock the Doctor Who Series 9 steelbook. And they also did not stock the previous 4 Sherlock steelbook.