Your search for "potassium citrate effervescent tablets" revealed the following:

Sale price £36.20 Regular price £50.00 Sale
Sale price £19.99 Regular price £30.00 Sale
Sale price £128.83 Regular price £150.00 Sale
On Sale from £69.99 Regular price £90.00 Sale
Sale price £59.99 Regular price £90.00 Sale
Sale price £32.99 Regular price £40.00 Sale
Sale price £78.95 Regular price £90.00 Sale
Sale price £86.36 Regular price £90.00 Sale
Sale price £94.95 Regular price £130.00 Sale
Sale price £63.32 Regular price £90.00 Sale
Sale price £39.95 Regular price £50.00 Sale