I use the official bookies SP in mine, which means the official after-the-races prices.

These are available from AAP Racing and Sports. Offical tote dividends are availlable from the various tote operators or if you want the prices on offer at the jump then try either IAS (Mark Read) or Sportingbet ( the latter offers the best pricing service).

Historical SP's can be obtained from RSB (via the Racing Victoria website).

Not sure where you can get the prices for the harness races as many meeting don't even have any on track bookies anymore and some may have only one or two.

Moonee Valley harness as an example only have three bookies for their run-of-the-mill meetings.