How much does a Magic: the Gathering booster box cost?

At the comic book shop: about $120.

Online - depending on where you shop, $90 plus $5 or $6 shipping.

I recommend starcitygames.com - I've ordered countless cards from there, never with a problem and always with comparable prices.

PS - M10 is the best core set Magic has ever realeased, as they finally included new cards, including mythic rares, in their core set. Zendikar is OK, but fairly one-dimensional in my opinion.

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RE:

How much does a Magic: the Gathering booster box cost?

I'm starting to play Magic again, and seeing as how M10 and Zendikar have the cards I need, I want to maybe buy a booster box of one of them.

Boosters have random cards, so there are no "good booster for a green deck". As our friend above said: you should buy some preconstructed decks with many green cards in them. But, if you want to buy only boosters, try to find some boosters from Judgment expansion. Even when they have random cards too, the number of green and white cards is bigger than other expansions. Good luck.

Zendikar and M10 booster boxes are both $90 on average.

around $120

what do you mean by M10?