We like your idea of booking something now in Manhattan and try to get
better deal as time gets closer. But we do not know how? All these
internet hotel booking sites requires you to PAY now when booked, and
almost impossible to cancel or changes, once you make the purchase.

Ever think of researching hotels for location/price and then calling
them DIRECTLY? ;-)

--
"A nickel isn't worth a dime today." - Y. Berra