Your search for "effervescent tablet" revealed the following:

On Sale from £39.45 Regular price £50.00 Sale
Sale price £96.64 Regular price £130.00 Sale
Sale price £69.68 Regular price £70.00 Sale
Sale price £89.99 Regular price £130.00 Sale
Sale price £35.35 Regular price £40.00 Sale
Sale price £69.99 Regular price £90.00 Sale
Sale price £36.98 Regular price £50.00 Sale
Sale price £96.99 Regular price £130.00 Sale
On Sale from £25.20 Regular price £30.00 Sale
Sale price £75.19 Regular price £90.00 Sale