After crunching some numbers on it, I found that brand A is the cheapest, and therefore <span style="color:#0000ff;"><b><u>is best buy</u></b></span>/<span style="color:#008000;"><b>the best buy</b></span>.<br/><br/>Could you(native speakers) correct my sentence, please?<br/><br/>Thanks.<br/><br/>Isabelle