Chalalan - Just a warning - the bamboo ones do take AGES to dry - so make sure you have enough! (I've got 28 for my newborn & it's only just enough to allow for washing every second day). Also, you are supposed to be able to use 2 PUL covers during the day & just alternate between them, but I find they get smelly & don't always dry in-between changes (I imagine this will be better when DS is older, but at the moment I am changing him every 1.5 - 3 hours & they don't always get time to dry). Sometimes I am rotating between 4 PUL covers during the day (so you may need more than they suggest).
HTH