Hi,
Here is a link to the [http://tim.id.au/laptops/lenovo/thinkpad%20t30.pdf|service manual] for your laptop.
Scroll to p.77 to view the necessary pre-requisite steps and then the procedure to remove the keyboard.
Scroll to p.153 you will find the part numbers for all the available keyboard types for this model.
If you search online ''using the part number only'', relevant to your requirements, you will get suppliers of the part. The part number should also be printed on the keyboard as well.
Hopefully this is of some help