Sold Out online at the moment, but got one in the Scarborough store today and its available to Reserve and Collect, and they appeared to have plenty in stock. (not sure about other stores but its one of their promoted offers so likely to be plenty of stock around)
I am aware that the saving isn't as much as £335 as halfords original price is over priced, but the offer makes it a good price for a good quality cabinet and chest.
Its obviously not the kind of thing everyones going to want in their garage, but for those who do its a good deal.
(sorry if this has only been posted, but i couldn't find it)