Your search for "effervescent tablet" revealed the following:

Sale price £70.24 Regular price £110.00 Sale
On Sale from £59.95 Regular price £90.00 Sale
Sale price £77.99 Regular price £90.00 Sale
Sale price £32.40 Regular price £40.00 Sale
Sale price £46.30 Regular price £70.00 Sale
On Sale from £26.50 Regular price £30.00 Sale
Sale price £72.99 Regular price £90.00 Sale
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Sale price £48.83 Regular price £70.00 Sale
On Sale from £23.80 Regular price £30.00 Sale
Sale price £86.09 Regular price £110.00 Sale