Hello Frank Bannon,
we does not sell pre-programmed parts. We sell the parts with Kinetis Bootloader.
Kinetis Bootloader (KBOOT) is a configurable flash programming utility that operates over a serial connection on Kinetis MCUs.
It enables quick and easy programming of Kinetis MCUs through the entire product lifecycle from application development to final product manufacturing and beyond for updating applications in the field with confidence.
The bootloader is delivered in two ways: as full source code that is highly configurable; or pre-programmed by Freescale into ROM or flash on select Kinetis devices.
Host-side command line and GUI tools are available to communicate with the bootloader. Users can utilize host tools to upload/download application code via the bootloader.
We have a table of supported devices:

You can see more information at Kinetis Bootloader|Freescale
I hope it helps you,
Iva