UPDATE x2: Amazon.com have reverted their price to the much higher $326, only 35% off. Bit if you didn't get the great deal, don't worry, that's what Amazon.ca is for, where it is stlll a more reasonable $282.66 or $216 US.
UPDATE: The price has dropped further slightly. Amending…
At this price, it is cheaper from comic book stores to order the Secret Wars Battleworld Box Set from Amazon than from Diamond Comic Distributors. Indeed, it is unlikely that this 67% off the cover price will be maintained for long. Some may even see some speculative possibilities in a $500 box set being sold for $163.53, free shipping. Certainly Amazon will be making a loss on this one.
Maybe you can make a gain?
Even with shipping from the USA to the UK, it will be a better deal than the Amazon UK price which gives you a whopping 7% off cover price at £323.85.
The US price, even with shipping added comes to $241.46 or just over £150 – less than half the Amazon UK price.