For those (like Lauren) who are curious and/or would like to try out our diapering system, this is what works for us:
Pre-folds: Unbleached Indian cotton. You can buy seconds to save money. (about $12 a dozen, depending on size). You'd want about 2-3 dozen, depending on how often you want to wash.
Covers: I really love my Thirsties covers. They have a new Duo Wrap that comes in two sizes instead of four so you only need to buy twice. Another great option that I personally love are wool covers. They are waterproof, breathable, and so dang cute! Try Woolly Bottoms for some cute recycled wool covers. Or make your own. You need probably 4 covers, we did fine with only one for a few weeks.
Snappi: To secure the diaper. You only need one or two.
Wet bag: We have a Bummis tote that lines our diaper pail. The diaper pail is a little bit of an investment, but the diapers NEVER smell up our tiny apartment and it doesn't even smell on the inside. Even if I leave them in there for a few days before I wash. The carbon filter really does work. The Bummis liner is not as impressive. I'd buy a different liner that's cheaper and can be washed with your diapers. You also need a small wet bag for your diaper bag. I like the Gro Baby one.
Doublers: If you have an older baby, you might want some doublers. The ones with fleece are nice because they keep your baby dry.
Wipes: We bought fancy bamboo wipes, but they work the same as the Gerber baby washcloths you can get for super cheap at any store. Buy a few dozen and just wet them and store them in a wipes warmer.
Detergent: We use Allen's.
Diaper sprayer: We don't have one, but I bet they are nice!
We also have a few BG diapers and Happy Heinys, and they are still a little big on him but we use them every so often when we run out of pre-folds. They are just a more expensive option and we tried to go as cheap as possible.