Your search for "Effervescent tablet" revealed the following:

Sale price £39.70 Regular price £50.00 Sale
Sale price £74.99 Regular price £90.00 Sale
On Sale from £42.59 Regular price £70.00 Sale
Sale price £69.99 Regular price £90.00 Sale
Sale price £38.42 Regular price £50.00 Sale
Sale price £45.26 Regular price £50.00 Sale
Sale price £36.97 Regular price £50.00 Sale
Sale price £46.98 Regular price £50.00 Sale
On Sale from £39.99 Regular price £50.00 Sale
Sale price £83.04 Regular price £130.00 Sale