Your search for "effervescent tablet" revealed the following:

Sale price £26.99 Regular price £30.00 Sale
Sale price £19.99 Regular price £30.00 Sale
Sale price £29.70 Regular price £40.00 Sale
Sale price £24.45 Regular price £30.00 Sale
Sale price £9.99 Regular price £16.00 Sale
Sale price £56.99 Regular price £70.00 Sale
Sale price £16.99 Regular price £20.00 Sale
Sale price £33.99 Regular price £40.00 Sale
On Sale from £51.19 Regular price £70.00 Sale
Sale price £46.06 Regular price £50.00 Sale
On Sale from £31.97 Regular price £40.00 Sale