I hear you, it's frustrating. I'm currently hunting a sold out bag myself. I definitely suggest keeping tabs on each season's threads here on TPF, lots of people share screenshots from instagram well before the collection is released, and then you can immediately reach out to your SA long before the items hit store shelves or the Chanel website to get on a list.
I have also had luck finding what I was looking for in brand new condition in the Chanel facebook groups. There are lots of personal shoppers there, but also lots of people who are selling here and there from their own collection, or maybe having buyer's remorse and don't want to offend their SA. That is how I was able to score a sold out piece from last year's cruise collection that I was looking for without paying a premium. The 21P caramel is an insanely popular color but rest assured, it won't be the last caramel Chanel produces- In fact I think there is another one coming in 20A.
I have also had luck finding what I was looking for in brand new condition in the Chanel facebook groups. There are lots of personal shoppers there, but also lots of people who are selling here and there from their own collection, or maybe having buyer's remorse and don't want to offend their SA. That is how I was able to score a sold out piece from last year's cruise collection that I was looking for without paying a premium. The 21P caramel is an insanely popular color but rest assured, it won't be the last caramel Chanel produces- In fact I think there is another one coming in 20A.