I am a bit of tight ass and never spend more than $15 on a nappy. I have bought heaps second hand, or get them on sale. Sign up to the nappy companies' newsletters you like, cos they all have sales .
This is great advice, I got an email today Green Kids 40% off some of their stock in a two day boxing day sale. (I loved their OSFM pockets). Other places might have sales too.