Just been into the Debenhams branch in Worthing and they have several different designs of shower curtain on 70% off sale, plus there is another 25% off as part of their 4 day spectacular.
There were two price bands:
RRP £18.00 reduced to £4.50 less 25% = £3.37.
RRP £12.00 reduced to £3.60 less 25% = £2.70.
The shower curtains are all reall good quality thick vinyl and come in about five different designs, mostly in blue, green, white or clear.
This is probably an offer which might vary from store to store, but they had about 50 curtains in the Worthing branch so possibly no shortage of stock nationwide.
The picture is an example from the website, although there are not the same reductions online.