firstly to add to Mels post...

You can resell! Can't resell a used sposie.
If you buy a OSFM (like Baby Beehinds Bamboo which are wonderful as a day and night nappy) they can last until TT.

The outlay is more initially, but over time it is SOOO much cheaper to buy MCN over sposies. Do the math of $30 a week for sposies, 52 weeks a year, most kids aren't tt till 2-3years old Buy 25 $25 nappies to last till toilet training... Most people can get away with buying less than that but I like to have overkill lol