Car transponder key cloning?

As someone who also hangs around in professional locksmith circles most modern car keys use some form of transponder. You should easily be able to get a door only key cut, but a transponder key also needs to be programmed.

Clk Supplies sells locksmith supplies and also has many you tube videos showing how to cut and program the keys as needed. They also have a vehicle search to assist you in reducing the number of relevant products you have to look at.

You probably don’t want to purchase a transponder cloning machine but you might be able to purchase an appropriate transponder from them for a few dollars and see if that and a Proxmark3 are sufficient.

In some cases I know that you can program the vehicle to accept a new transponder instead.