JW, sadly you are late to the party... The Box sets were released from 2006 until 2010, Nick Davis did all of the Surround sound mixes and the stereo mix downs.
In the USA those box sets were released as CD / DVD - A and in Europe as SACD (Multi Channel hybrid) and DVD - A.
Sadly, these are no longer on sale. The only outlets are either Ebay or Amazon... on both of these you'll be looking to pay crazy prices by those who have one or two left in stock or by someone who has opened theirs.
Sorry to be the bearer of bad news,