Your search for "effervescent tablet" revealed the following:

On Sale from £39.92 Regular price £50.00 Sale
Sale price £36.99 Regular price £40.00 Sale
Sale price £39.93 Regular price £50.00 Sale
Sale price £118.11 Regular price £150.00 Sale
On Sale from £52.25 Regular price £70.00 Sale
On Sale from £28.48 Regular price £40.00 Sale
Sale price £98.95 Regular price £130.00 Sale
Sale price £120.77 Regular price £150.00 Sale
On Sale from £25.25 Regular price £30.00 Sale
From £42.36
Sale price £29.94 Regular price £40.00 Sale — Sold Out