Arimeh's given u great adcie hun.
just thought i'd add, the best cheaper nappy that works well for us are baby beehinds. they are sized so it would eventually cost u a bit more but short term they're cheaper. DD2 has been in her mediums since about 4 months and she's still got plenty of growing room in them at 7 months.

or alternatively u could use prefolds with some funky covers.
Good luck, cloth nappies are great fun