Your search for "effervescent tablet" revealed the following:

Sale price £46.99 Regular price £50.00 Sale
Sale price £123.36 Regular price £150.00 Sale
Sale price £32.89 Regular price £40.00 Sale
Sale price £16.99 Regular price £25.00 Sale
Sale price £32.89 Regular price £40.00 Sale
Sale price £78.99 Regular price £90.00 Sale
Sale price £37.97 Regular price £50.00 Sale
Sale price £39.99 Regular price £50.00 Sale
Sale price £19.99 Regular price £30.00 Sale
Sale price £52.99 Regular price £70.00 Sale
On Sale from £29.19 Regular price £40.00 Sale
On Sale from £37.95 Regular price £45.00 Sale