Bookies
 

Centre racing offers slightly better than best of 3 totes or SP on Sat metro. They have a good clean site which is very easy to use.
I have no connection with them other than having an account there.

& betfair i suggest, i mainly bet the place & on average obtain better than the best of the 3 tabs

just my observation but it appears betfairs stronger markets have become a fairly accurate guide as to whats going on in the bookies ring, with about 5-10mins to go