The long period variable Mira (Omicron Ceti) is now bright enough to be seen in binoculars, even from light polluted sites. From dark sky sites it may be visible with the naked eye as it approaches maximum in November. For UK observers, Cetus is low in the south-east in the early evening, but over the course of the night, it will be rising higher in the sky.
Conversely, there have been some observations suggesting that R CrB has faded slightly over the course of September (from magnitude 6.1 to 6.9). This could only be a slight fade, with R CrB remaining visible in binoculars until such time as it brightens again. However, this could be the start of other long fade to minimum brightness. Corona Borealis is low in the western sky as darkness descends, but provided you have good western horizons, it should be possible to make some more observations before the star disappears behind the Sun.