There is still a considerable difference in price:-
Zavvi GBP 24.99 including free shipping
The Hut GBP 17.98 including shipping
Both use cardboard packaging and I doubt the white cardboard box is more expensive than the equally excellent thick cardboard wraparound packaging that the Hut use although the thin piece of foam protection may add a few pence to the Zavvi packaging and anyway the foam is surplus to requirements in The Hut packaging.
If Zavvi didn't have Free Shipping their price would most likely have been GBP 23 + GBP 1.99 P&P which is still expensive compared to The Hut's price.
It don't make any difference as a company they can list same products on any of their websites and also can have different prices
Its simple Order with the Hut for the cheaper price
If you get both just send the Zavvi one back for a refund
I would advice keeping both orders just incase its been oversold on the Hut Website and if you get both delivered keep the one you happy with the most in terms of condition
There was no way this sold out in 1 hour the day it went live and I suspect most did not fall for the Zbox combination that's still available and pay a crazy price and they decided to sell the steelbook on its own on the Hut instead of putting back available on the Zavvi website
Keep both orders and just send back the one you don't want for a refund
The Hut don't include free shipping you pay separate shipping of £1.99 if price is under £20.00
Only orders over £20.00 include free shipping and only for those on the UK
Outside of the UK for example Ireland its £3.99 ( €4.99 Euro Shipping cost)
http://www.thehut.com/articles/delivery-information.list
http://www.thehut.com/articles/international-delivery.list
The Hut Packaging from previous members mentioned sometimes they received a steelbook in a cardboard mailer
and other times the usual Zavvi white box