Cheeky Wipes are doing a good bundle deal on IB nappies - 6 nappies and 8 extra booster sets. But they don't hold loads of stock so you could end up having to wait for part of the order. I have to agree that Nappy Paradise were the cheapest I could find.
When you get to the checkout section, there is the post options, and it says regular post or something like that, click on it and then there are several options including free forum. I chose the first purchase free option to start with.