Your search for "effervescent tablet" revealed the following:

Sale price £93.90 Regular price £130.00 Sale
Sale price £139.95 Regular price £200.00 Sale
Sale price £52.92 Regular price £70.00 Sale
On Sale from £44.99 Regular price £70.00 Sale
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Sale price £88.84 Regular price £90.00 Sale
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Sale price £136.07 Regular price £150.00 Sale
Sale price £47.99 Regular price £50.00 Sale
Sale price £69.95 Regular price £90.00 Sale
Sale price £69.99 Regular price £90.00 Sale