This will be my 3rd baby sewing diapers for. And I absolutly love it! I'm going to make 24 sherpa fitteds in NB and 24 one size Cotton/bamboo velour fitteds. I priced out fabric and notions and it will cost about $280. This is using all new materials and not the cheapest stuff either. But there is no way you could buy these diapers for that much so I'm happy.
There are some great free patterns if you want to practice with upcycled materials :) old tee shirt fitteds have always been a favorite of mine.
http://themafiatutu.blogspot.com/2010/04/free-cloth-diaper-pattern.html this is a great pattern it is well designed and has great step by step directions. (I used to be friends with the designer, I know how much work she put into it)
Be aware diaper sewing is majorly addictive! lol