Your search for "Effervescent tablet" revealed the following:

On Sale from £32.79 Regular price £40.00 Sale
Sale price £16.15 Regular price £20.00 Sale
On Sale from £39.45 Regular price £50.00 Sale
Sale price £41.27 Regular price £50.00 Sale
Sale price £79.03 Regular price £90.00 Sale
On Sale from £37.50 Regular price £50.00 Sale
Sale price £29.94 Regular price £40.00 Sale — Sold Out
Sale price £33.95 Regular price £40.00 Sale
Sale price £39.95 Regular price £50.00 Sale
Sale price £32.95 Regular price £40.00 Sale
Sale price £59.48 Regular price £70.00 Sale