Bumgenius - which boosters are best and where do I get them from?

[mummytowillow]

I need to start boosting my lovely Bumgenius as they are leaking on my 16 month old daughter. I've got 9 cotton bottoms microfibre boosters but need some more?

I was thinking of hemp boosters, are they better or the same and where do I get them from at a good price?

Thanks