[quote name='Zaku77']Yes, it's worth it. You will never find a new copy for that price and are very likely to pay more for a used on even. I also picked mine up at K Mart last summer.[/QUOTE]
The amazing part is that I picked up my copy used at GameStop for $34.99 (plus tax). It was 'used' but there was no damage to the box, artwork, or game... and there was no save data. Something didn't add up for it to be marked used.
But yes, $39.99 for it is a great price, given that it goes from $60-65 now. The only time it sells for $40 or less is if someone doesn't know the true value, or if it's an import copy.