This is for pickup next Wed (2/5) for a three week stay. Note that includes the Presidents holiday. Total for three weeks with taxes and fees is $428. Rates for this have really just started dropping as the arrival day has approached. I would bet that will happen for your March dates also. I have modified this reservation 5 or 6 times as the rates have dropped. No change fees, so why not?
You're right....if there are no fees upfront...no harm no foul!! Book early and often!