Your search for "effervescent tablet" revealed the following:

On Sale from £29.99 Regular price £40.00 Sale
Sale price £49.95 Regular price £70.00 Sale
Sale price £60.98 Regular price £90.00 Sale
Sale price £69.95 Regular price £90.00 Sale
Sale price £89.59 Regular price £130.00 Sale
On Sale from £68.99 Regular price £90.00 Sale
Sale price £53.99 Regular price £70.00 Sale
Sale price £53.50 Regular price £70.00 Sale