I am almost certain such a service doesn't exist. The nearest you will get is the Darwin All Sports site which gives fluctuations although they are incomplete and inaccurate. They are not available to view after the day of the race as they are wiped to make way for the new days races.
AAP or the race clubs should look at including them in their results as a lot of punters now bet top flucs with their bookie ... if you bet an a day other than a Saturday you can't even find them in the press.