Those are good but not great prices for those bikes. You can try the "hang around trick" to see if they get desperate and throw you a bone. Each LBS is different so I don't know how they will react. I usually try to get as much research on what the bike is worth before pulling the trigger. The good thing is your getting a new bike at a discount

Trek 1500 $1,099.99-$950.00=$149.99 Savings
Trek 2100 $1,679.99-$1,120.00=$559.99 Savings.