There are now two hidden idols found, which means no more in circulation. Russell has one, Parvati the other. But they're both about to be used (see the boot page for more details).

    About the remaining idols to be found up until this point, SurvivorsUnite says there are four hidden idols found during the game, and all are played to take a player out.  survivrcuz begs to (slightly) differ, stating "more than 4 idols will be played and only one by the heroes the rest all villains, each time one is used it goes back in to play."
    Based on the boot spoilers, however, SurvivorsUnite says two hidden idols get played at this episode's tribal council.