30% off at HarperCollins Today

Do they even have their own deluxe in stock?

No they don't.

They appear to be out of both editions of NoME as well.

£105 for the deluxe would have been quite competitive at this point. Pretty useless stuff from HC.

Always seems to happen this way that when they have these occasional sales, anything you might actually want is excluded or not in stock. I'm not really sure whey they bother.