My colleague recent bought that exact bike from one of the shops here for $720, 10% discount, during a holiday sale. I'd wager there is definitely room for negotiation.
As for accessories, you may need a lock if you don't already have one. A u-lock is highly recommended. Whether or not you decide on a helmet is up to you, but if you buy one at the same time as your bike, you may get some kind of discount on it. Some people choose to get Pitlock or Pinhead locks to secure their wheels and possibly their saddles in place of QR skewers. Racks, fenders, and kick stands could also be considerations.
Reflective velcro probably isn't going to stick to your backpack unless for some reason you have one side of the velcro material attached to your bag.
Originally Posted by Trek website
An important note about our dealers: Trek Bicycle Corporation does not authorize our retailers to sell new or used Trek product over the Internet or by mail order. Delivery should only be made to you at an authorized Trek retail location. This is for your safety. We want to make sure that your bicycle is properly assembled, properly adjusted, and is the right size for you. We also want to make sure that you receive your owner\'s manual and consumer literature. Your Dealer will also explain how to properly use your bike and answer any questions or concerns you might have.