Your search for "effervescent tablet" revealed the following:

Sale price £93.27 Regular price £130.00 Sale
On Sale from £65.61 Regular price £90.00 Sale
On Sale from £32.48 Regular price £40.00 Sale
On Sale from £25.85 Regular price £30.00 Sale
Sale price £13.99 Regular price £20.00 Sale
On Sale from £100.50 Regular price £130.00 Sale
Sale price £49.99 Regular price £70.00 Sale
Sale price £39.99 Regular price £50.00 Sale
Sale price £98.25 Regular price £130.00 Sale
On Sale from £25.65 Regular price £30.00 Sale