My water conditioner just ran out today and I was buying more on Amazon and decided to just buy it on "Subscribe & Save" since it was £1.50 or so cheaper but when I clicked on it on the next page it came up even cheaper.
Initially it was saying to be delivered on like the 14th of August or something but I went into my subscribe and save (which I never used before and don't have anything) and changed it to the closest date which was the 27th of July and it updated and is now coming then.
Worth a try if you need it to see if you can get it almost half price as well?
https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1
I just clicked on the voucher bit(its not there for me now if I try it again as I assume I used it) then seen the price was like £17 something and I clicked Set Up Now and on the next page it said it was only £10.17.