Google a site called buyforbaby, it sells second hand mcn's. Avoid ebay! I can't wait to try out my mcn's on my little girl . Watch out for the cloth nappy girls, they will have you addicted in no time.

If you buy new, many sites have trial packs with three nappies and boosters / liners etc.

EDIT: how do you feel about fitteds + covers, vs AIO?