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Finish All in One Max 31 Lemon Dishwasher Tablets , Pack of 5 (155 tablets) £15.88 Prime / £20.63 Non Prime @ Amazon (cheaper when you S&S)
£15.88Amazon Deals
Works out at 10.2 p/tablet. Even cheaper if you opt for subscribe and save (then cancel after delivery)
Fully agree, aim for 10p a wash on premium tabs are your doing ok