Chanel has stopped producing the single jumbo flap and will move forward with the double flap jumbo. Some retail stores like Neiman's and Saks might still have some single flap jumbos. You will have to call them and check.
I just returned a single flap lambskin, black with goldhardware, today to Neiman Marcus at La Cantera in San Antonio, Texas. I mailed it back today and it is to be there tomorrow if anyone is interested. Talk to Cedric in Chanel handbags. It was $3500.00 I have a black caviar with ghw and thought I just had to have this bag, but after trying it on, I like the structure of the double flap and decided to send it back. He looked everywhere for this bag. I feel bad for sending it back.