15% off weekend at Wickes. Also £7.93 topcashback (which has tracked immediately for me) taking it to £417.06.
It's obviously gotta be something you're looking specifically for but I've been looking for a new shed for a while, and after seeing the Amazon deal of the day, I still wanted the 8x6 so looked a little further online. Has seemingly not been under £500 for some time, at least for the last couple of months I've been shed hunting anyway.
I've ordered - hope this helps someone else!