This isn't going to work for everyone, but hopefully it'll help somebody out.
If you're an Amazon Prime Member who can accept a delivery to a Prime Now area, but you haven't used the Prime Now app before... read on!
Put Zelda in your basket (dependent not stock in your area) and add the code 10NOW40. This has to be done on the Prime Now smartphone app it won't work on the Amazon website.
Technically you can get £10 off any spend over £40.
If you don't have Prime you might be able to get another free trial if you've not had it recently. Check your account.
Hope it works for somebody!