Your search for "Effervescent tablet" revealed the following:

Sale price £32.42 Regular price £40.00 Sale
Sale price £19.99 Regular price £30.00 Sale
Sale price £16.99 Regular price £22.00 Sale
On Sale from £31.25 Regular price £40.00 Sale
Sale price £126.44 Regular price £150.00 Sale
Sale price £21.84 Regular price £30.00 Sale
Sale price £30.75 Regular price £40.00 Sale
Sale price £28.18 Regular price £70.00 Sale
Sale price £75.48 Regular price £90.00 Sale