Not sure about the weekly but we used 200+ nappies the first month with Wyatt so at huggies prices that's prob $80 for the month.
Plus wipes at up, we use cloth.
Not to mention the exy breastpads, I'm just switching to cloth there also.

As for the reselling- most of mine are one size fits most so I don't have to keep buying. I have some itti d'lish which are sized but in future I'm gonna go for the tuttos so I can change the size.
There is a 2nd hand nappy trading website, can't remember the name! Just have a google.
Also there is the buy swap sell thread on here

Can you buy the ittis in America? If you look back a page or so mrsbexie mentioned a uk site that looks great, I worked out the tuttos are about $25 AU

Thanx for that btw mrsbexie!

wowb- turquoise itti d'lish