Your search for "Effervescent tablet" revealed the following:

Sale price £42.57 Regular price £70.00 Sale
Sale price £68.82 Regular price £70.00 Sale
Sale price £26.28 Regular price £30.00 Sale
Sale price £13.99 Regular price £20.00 Sale
Sale price £69.99 Regular price £90.00 Sale
Sale price £37.99 Regular price £50.00 Sale
Sale price £25.07 Regular price £35.00 Sale
Sale price £134.76 Regular price £150.00 Sale
Sale price £39.99 Regular price £50.00 Sale
Sale price £39.95 Regular price £50.00 Sale