Your search for "effervescent tablet" revealed the following:

Sale price £118.95 Regular price £150.00 Sale
On Sale from £69.34 Regular price £90.00 Sale
Sale price £128.47 Regular price £150.00 Sale
Sale price £78.95 Regular price £90.00 Sale
Sale price £140.76 Regular price £200.00 Sale
Sale price £35.03 Regular price £40.00 Sale
Sale price £69.99 Regular price £90.00 Sale
Sale price £119.16 Regular price £150.00 Sale
Sale price £94.99 Regular price £130.00 Sale
On Sale from £74.90 Regular price £90.00 Sale