The classifeds it a great (but evil for bank accounts if you buy too much!) place to get cheaper nappies.
Most cloth nappies work the same as a disp. some come in two parts (the bit thats absorbs and a outter waterproof cover, that's an All in two or AI2), some are all sewn togerther (an All in one or AIO), there's also pockets, which are like an AIO in the way that they don't need a waterproof cover (there's one built in) but they have an opening on the inside so you can 'stuff' them with boosters. Boosters are just extra bits of fabric that make nappies more absorbant.
There's other stuff too (wool, fleece, types of fabric for the nappies) but hope that helps for starters! There's a lot of WAHMs here so they'll be able to answer better probably
And I'm a Single SAHM too
So i know how you feel money wise!