As well as the hemp and bamboo boosters and inserts you can buy from the Greenkids range of nappies here.  Nappyzone also sells a few different types of microterry inserts and boosters.

One life snap in boosters, these are boosters for the onelife nappy and are being sold off as a useful booster to use in any of your nappies, ideal to give your day or night nappies a little boost.