Do you sew? Fitted nappies or pockets (which include a waterproof layer) are quite easy to make. You can find free patterns online (or make your own) and there are sites that sell all the materials you need.

If you're buying mcns, get a few different kinds - they vary a bit in size/style and different ones will suit different babies. For eg, with my DS, the wide-crotch styles (like BumGenious and Green Kids) suited him quite well, but my DD has fatter legs and the narrow crotch ones (like itty bitty for eg) work better for her.

I like pockets as they're easy to use - only 1 piece, not nappy + cover - but come apart so they dry quicker. However, very young babies can poo a lot so you need lots of nappies. We used the old terry cloth ones for DS for this reason - much cheaper. DD doesn't poo so much, so we've been in fitteds & pockets.