Have to second Bumgenius (BGs) as I have 20 of them which I use for Max when he with the ILs and they are great. They come with 2 microfibre (mf) inserts - one newborn and one thicker one for when LO is bigger and/or peeing heavier - put together they last Max about 3 hours and he is a heavy-wetter.
For my other pockets I use Petite D'sous and Easy Peasy hemp boosters (but after what Kirsty said I may combine that with a thin mf insert as well! See, even us non-newbie learn new stuff all the time
P'tite D'sous: http://www.babykind.co.uk/pocketnappyin ... mbooinsert
Easp Peasy hemp boosters: http://www.babykind.co.uk/boostersandli ... #hempjersy
they also do a mf booster so you could use the hemmp and mf together.
Blueberry One size inerts are a combo of hemp and mf: http://www.babykind.co.uk/pocketnappyin ... mbiinserts
Keep in mind that the bamboo inserts will take several washes to reach their full absorbency
Other sites sell inserts too but I gave you the Baykind link as I know they definitely stock them.
Also check out Green Kids inserts: http://www.nappyzone.co.uk/greenkids.htm
(scroll to the bottom of the page)
Hope this helps
ETA to say: if you're looking for other pockets to use for nursery then aplix fastening will be the easiest for people to use so try BG, Greenkids, Happy Heinys and you could always have a few WNOS for cuteness