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Does anyone know the best place to get a brand new Assault on Black Reach boxed set, at a cheaper price than GW?

There's a whole thread on saving money on GW here:
http://www.dakkadakka.com/dakkaforum/posts/list/426923.page

You're from the UK far as I can tell, so go with Maelstrom games.
https://www.maelstromgames.co.uk/

If your American and your flag got screwed up, The Warstore is where it's at.
http://www.thewarstore.com/

Check online at the vaious websites listed, also check ebay.