Using ILAC method

Scenario 2 - AGREEMENT

Johnny wishes to purchase a new MP3 player. He visits BJ Hi-Fi and checks out the range of MP3 players they have available. One particular model, the Orange ePod, is on sale: there is a small stack of ePods under a sign that states: 'Special offer! Only $100'. Johnny says to himself, 'Well, that's an offer that is too good to refuse', and takes one from the stack. He takes the ePod to the counter, hands it to the cashier, and says 'I'll take this'. He then remembers seeing ePods on sale for $90 at another store. He says to the cashier, 'I'm sorry, I've changed my mind'. The cashier responds, 'No, I'm sorry, I'm afraid it's too late. You have to buy this now. You are legally committed.' Is the cashier correct? Focus upon whether or not there is an agreement between Johnny and BJ Hi-Fi.