Prefolds & Covers:
If you're up for 'any' diapering method, skip the latest and greatest, and go back to tried and true. This is definitely a very inexpensive, yet effective way, to cloth diaper your child. And not to mention, when you are done with the prefolds, they make awesome cleaning rags!
Some may gawk at this idea, but great deals are to be had when buying cloth diapers used. Check your local Craigslist or children's consignment sale. Another great place to check is your local Freecycle. It's as simple as sending out a message asking for cloth diapers - you never know what response you'll get!
If you're preparing for baby, start a wishlist at amazon.com or any cloth diaper website. Let people know your desire to cloth diaper your baby and pass along the information for your wishlist. If your baby has already been born and you're making the switch, start a holiday or birth wish list with the diapers you are interested in.
You may find out that you have friends who cloth diapered their children and are done with their stash, even just temporarily. They may be willing to loan you their stash as you get started (what a great way to give cloth diapers a trial run!)
OK, while this isn't a reliable method of building your stash, it is a great way to try out new diapers for free! Check out Facebook and blogs for giveaways that happen everyday. You might not win, but if you don't enter, you can't win!
What ways have you been able to save even more money while making the switch to cloth diapers?