3 x 16 dolce gusto americano pods £9.05 @ amazon with free supersaver delivery. Skinny cappuccino is the same price other varieties are a bit more.
£3 odd a box they are £3.46 at tesco sainsbury asda the price fixers.
Price includes 10% discount with "subscribe and save" where you'll automatically receive a new delivery of the item in the interval (every 1,2,3 and 6 months) that you select, at a 10% discount of the everyday price. Plus, all subscription orders ship free to United Kingdom and Ireland.
It says on Amazon that you pay for each order only when the item is dispatched and have the option to cancel at any time so i guess if you just want the 3 boxes you could order and cancel once they've been dispatched.
I ordered 3 americanos yesterday they arrived today! (2nd March)