Yes, they are still on the market. The dinosaurs of the rechargeable battery technology. You can find them mostly (still) in old transistor radios, torches and some further elder devices.
These rechargeable / disposable batteries are point-of-view Performance / Capacity unreasonably expensive and also very heavy.

At last this (also) is over and done with:Thanks to the Battery Adapter from SwissBatteries. Simply put a (rechargeable) AA battery in the corresponding adapter and then you already have the (rechargeable) High Power convenience of a C / respectively D Cell.

Following both Adapter are available :