(You can read about some of my cloth diaper findings here and here and here.)
I love these liners because they are very soft against Ruby's skin, and they act as a little barrier between her bum and the diaper, so they end up keeping the diaper nearly spotless. My husband and I agree: they rock. They make life easy as pie.
Unfortunately, as far as I can tell, Bummis liners are not available here in the Pioneer Valley (of course).
You can order them online, or look around locally for another brand. A Child's Garden and Cradle both carry liners, I believe, but I would make sure they are soft. (I got some liners a while back at A Child's Garden and I felt that although they were more substantial for holding poo, they felt way too rough!)
In addition to using the glory and wonder that is flushable liners, we also did this hook up of a DIY cloth diaper sprayer to our guest bathroom toilet.
We have used it plenty times, but as our daughter has gotten older (she's nearly 6 months old!) and since she has started solid foods, we have used disposable liners more and more, and the need for the sprayer has become less and less.
In fact, the liners protect the diapers so much that I haven't used the sprayer in at least a month. Amazing!