Monthly house hold costs (Lagos)

Hi,
I'm moving to Lagos within the next few months, but still negotiating salary, so im trying to get a picture of living costs there.
I've been struggling to find an approximate cost of living pr month, for a 2 person household.
This is not considering the going out to eat prices, but just groceries for home.
Any chance some of you could ballpark this for me?
Much Appreciated!
TheDane