Which type of nappy are you using, often certain all in ones or pockets with microfibre won't last; heavy wetter or not! Two part nappies are often very good but my girl is a HV and bumgenius pockets, fuzzis, bumgenius organic aio and ittis last well.
Can you get some pockets and hemp/bamboo inserts? These will last a lot longer than microfibre, you don't have to spend out for the newest version of pocket nappy e.g. bumgenius v4 aplix is pretty much exactly the same as the v3 which you'll find very cheap on here preloved (I've seen them go for £5), the v4 poppers are good though, take a look at the classifieds and see if there is anything you could try out cheaply, I buy all my nappies preloved!
Remember if you do up tight clothes over the nappies you will have wicking problems, this isn't leaking but where the clothes (ofte bodysuits or tights/leggings) push on the nappy and then the moisture comes outs often the sides, you can buy vest extenders cheaply and baby legs or the next size up of tights/leggings usually works.
There are many ways of letting your dh know why cloth is better, this is one of them:http://www.happybums.co.uk/content/nappyfacts.asp
And a big list of reasons why to use cloth:http://www.treehuggermums.co.uk/article ... article=43
Tbh I've had more leaking from a disposable than a cloth nappy, they just aren't up to the job of holding in wee and poo explosions.
Good luck and keep asking for advise on here