Free calculator

Hello! Was reading and found a free calculator @ Staples, plus potential to make $3 with rebate! They have in thier ad a Sharp calculator for $6.99 and get a rebate for $6.99 - well, in some stores these calculators are ringing up for $3.99 and then you send in for the easy rebate that prints on the bottom and get back $6.99 - thus making $3!!!