For SIO/AIO D'lish ...
Jabula have Small SIO's for £10.99 ... http://jabulababy.co.uk/index.php?main_ ... 20a&page=1
Millies Nappies have all sizes at £12.49 in the plain colours & £13.50 for Ltd Ed Prints ... http://milliesnappies.co.uk/index.php?m ... th=9_19_33
Nappy Garden have some at £13.00 ... http://nappygarden.co.uk/index.php?main ... tqsmj9pm82
as do Bibs & Bots ... http://bibsnbots.info/a-i-o-nappies-itt ... sh-c-34_35
Cheeks & Cherries have the SIO at £13.95 plain colours £14 prints
AIO at £12.95 plain colours £13 printshttp://www.cheeksandcherries.co.uk/acat ... Bitti.html
I seem to remember that the AIO is discontinued so you are likely to get the cheapest deal on those
For the Tutto ....
Bibs & Bots @ £17.50 http://bibsnbots.info/all-in-one-nappie ... o-c-34_141
Millies Nappies again £17.50 ... http://milliesnappies.co.uk/index.php?m ... h=9_19_102
Cheeks & Cherries also £17.50
I think they'll be the same everywhere as they are so new, so no-one has excess or old stock to shift at lower prices, I think your best bet would be to see if you can get a multi-buy deal, perhaps get some others to go in with you if you only want one.