Your search for "effervescent tablet" revealed the following:

On Sale from £49.69 Regular price £50.00 Sale
Sale price £89.95 Regular price £130.00 Sale
Sale price £26.49 Regular price £30.00 Sale
Sale price £86.99 Regular price £90.00 Sale
On Sale from £89.87 Regular price £130.00 Sale
Sale price £36.99 Regular price £50.00 Sale
Sale price £78.95 Regular price £90.00 Sale
Sale price £29.99 Regular price £40.00 Sale
Sale price £34.49 Regular price £40.00 Sale
Sale price £63.97 Regular price £90.00 Sale