Yes yes yes, I agree! If I was where you are, I would be getting started, like one or two of each save-worthy kind to start. Waiting until a few cold, almost-frosty nights have gone by really puts Coleus (or a lot of tropical) plants under a lot of stress, making them have more trouble taking root when we well know this should happen within a few days. They don't necessarily need to come inside, but getting some roots going before any kind of serious cold comes around is a good idea, IME. Also, isn't it usually raining on 'panic night' when you know the first frost is coming? LOL! Also, flying through the plants like Edward Scissorhands means one won't notice little caterpillars, fugly leaves about to fall off as soon as you carry them inside, any other hitch-hikers.
I'm glad you said this though, it's time to collect more receptacles! Small-hole beer, water, soda bottles are easy to come by, but something with a much larger opening is so much easier to use - and tip over a lot less easily! Like peanut butter, jelly, instant coffee or tea, mayo... even stuff like margarine or cottage cheese tubs if they are deep enough. A few cuttings together hold each other upright, and no worry the roots will be too big to exit the hole in the spring. Something more attractive would be, well, more attractive, but who wants to spend the time, money getting it clean next spring from the expected hard water and likely algae deposits? Proceed at your own risk with non-recyclable items I say. There is more incidence of old leaves and flower bits falling in the water with a bigger opening (which can rot, so need to be removed pretty soon.) Some might prefer individual stems in smaller opening bottles because of that.
In the spring I plant everything back out in ground and pots, then use the receptacles to share new cuttings of the excess, recycle any excess. Start again in the fall.
