Your search for "Effervescent tablet" revealed the following:

On Sale from £39.74 Regular price £50.00 Sale
Sale price £81.50 Regular price £130.00 Sale
Sale price £29.90 Regular price £40.00 Sale
Sale price £38.95 Regular price £50.00 Sale
Sale price £49.99 Regular price £70.00 Sale
On Sale from £89.87 Regular price £130.00 Sale
On Sale from £32.19 Regular price £40.00 Sale
Sale price £69.95 Regular price £90.00 Sale
On Sale from £24.95 Regular price £30.00 Sale
Sale price £19.99 Regular price £30.00 Sale