Your search for "effervescent tablet" revealed the following:

Sale price £45.26 Regular price £50.00 Sale
On Sale from £42.59 Regular price £70.00 Sale
Sale price £69.99 Regular price £90.00 Sale
Sale price £24.99 Regular price £30.00 Sale
Sale price £38.42 Regular price £50.00 Sale
Sale price £42.84 Regular price £50.00 Sale
Sale price £49.99 Regular price £70.00 Sale
Sale price £98.95 Regular price £110.00 Sale
Sale price £79.94 Regular price £90.00 Sale
Sale price £65.99 Regular price £90.00 Sale
Sale price £54.99 Regular price £70.00 Sale
Sale price £40.80 Regular price £50.00 Sale