If i buy a boostmobile phone from Target what would the activation fee be?

Okay so i saw in the paper that the boost mobile Sanyo Incognito was 39.99 at Target and im interested in buying it from there. But if i do what would the activation fee be? Would i have to pay it up front?|||I saw Amazon has lots of great deals on their Cyber Monday page, I suggest you to check it, hurry up before the items out of stock http://www.amazon.com/b?ie=UTF8%26amp;node=384鈥?/a>