if you get a used one, try to stop by a dicks sporting goods later in the evening, sometimes they will help you set everything up for free. they cut me arrows and adjusted everything when i first got my bow. i like a 50# pull with a good 60%+ let-off so you don't get too tired.
never thought this would be the case, i'm sure they always keep boxes in the back just in case there's a panic. they do the same with water when people are stocking up for hurricanes and the such.