Your search for "Effervescent tablet" revealed the following:

Sale price £128.72 Regular price £200.00 Sale
Sale price £72.95 Regular price £90.00 Sale
Sale price £51.99 Regular price £70.00 Sale
On Sale from £28.98 Regular price £40.00 Sale
On Sale from £65.61 Regular price £90.00 Sale
On Sale from £32.48 Regular price £40.00 Sale
Sale price £13.99 Regular price £20.00 Sale
Sale price £69.99 Regular price £90.00 Sale
Sale price £75.49 Regular price £90.00 Sale
Sale price £96.37 Regular price £130.00 Sale
Sale price £59.28 Regular price £70.00 Sale