how much did you spend on diapers your first month home with baby?

J.
Just curious on average how much people spend on diapers in the first month? Also any strategies (or if you just bought full price), brands, stores you buy from, and did you find yourself constantly running to the store or were you set from the first week? 
I'm noticing target has a baby sale buy two giant packs of diapers $34.99 each get a $20 gift card.. Wondering if I should utilize that sale and get size 1 or 2s or just wait till he comes out and use the few packs I have of different brands now then run out and get more...  Thanks so much