Many don't take the time to go back and upgrade craigslist listings, as it can be a complicated process, at times, if one has many properties.
As mentioned below, inform the leasing office where you saw the price. There are standard prices and there are prices that those who find the properties via third-party sites pay. There's often a difference between them, as mentioned below.
If you need any help, give me a ring and I'll be happy to point you in the right direction.