Here’s our system at the moment:
Those freezer bags work out about half a cent (AUD) each. If you want to be quite generous in your calculations, each nappy disposal would still cost less than 1 cent. That is way less than the cost of the “sausage” makers and the scented nappy sacks.
Admittedly, we have to empty the bin more often, however, the garbage collectors come weekly anyway, so that is not a problem for us. If you don’t have such big bin like ours, and buy half the size (20L bins), you will have to empty it maybe once every 3 days (depending on how often your baby needs changing). This will further eliminate any smells coming from it.
The whole nappy disposal system is all new to me since, where I grew up in Indonesia, we still have piles of rubbish on open air for your neighbors to see. We don’t even line our bins inside the house with bags! To think that I have to spend more money just to rid of already-expensive nappy is just not for me, so this was our way of saving more on baby costs 🙂
Edited on 12 Jan 2014: A few months on, this system proven to be only good up until Little E starts eating more solids, and less BM. See my most recent post on this subject here 🙂