Buying a Blackjack 2 from Bestbuy help?

At bestbuy the Blackjack 2 sais its $50 and i was wondering if i could actually get it for $50 because i have a 2 year subscription and elligable for a new phone. Would it be that amount of money or is there a catch to it. Idk really how bestbuy sells their phones so i was wondering if someone could help me out. Thanks.