Kenco. 1  The price of Kenco Decaffeinated Coffee (200g) in Tesco is £6.99.For each 100g of Kenco Decaffeinated Coffee (200g) the price is £3.50. 2  The price of Kenco Decaffeinated Coffee (200g) in Tesco is £6.99.For each 100g of Kenco Decaffeinated Coffee (200g) the price is £3.50.