Some of the TABs are displaying Quinella approximates on their sites (NSW, WA, ACTTAB and I think the new Tabcorp site has them) - but you would have to follow the trends yourself. Nobody displays Trifecta approximates - with a 10 horse race there are 720 different Trifecta combinations so it isn't really practical! Not sure why you would want to follow trends in these anyway as they would be very volatile.