The case is available for £10 (slightly under $13) both during the transfer process for both new and existing Kia owners.

Before you ask: yes, Kia is fully aware that this isn't an ideal situation. It's promising that future wireless key fobs are "as close to impervious to attack as possible" through technologies like ultra-wideband signals and sleep buttons. This is more about acknowledging the issue (a particularly rampant one in the UK) and sparing drivers the trouble of hunting down an aftermarket option.