Where can I buy cards for this?
I'm trying to use this device to make my home computer more secure with it's access. I was wondering where you buy smart cards to use on this machine as well as if you can program it to use only that specific card.
You can. However, there will be additional expense.
A quick Google search for CAC cards for sale will find you the cards. But you will most likely notice that you have to buy them in bulk.
Next you will have to have a CAC Reader / Writer. While a lot of CAC Readers do not even advertise that they can write to the card as well these are not always readily available.
You will need a working knowledge of certificate management in the OS that you use. The certificate will remain on your computer or Authentication Server, and the Private Certificate will remain on the chip on the card. This will require validated certificates and can be a hassle when expiration dates are reached.
Lastly, I believe CAC authentication for the home is cost and time prohibitive, unless using an existing Enterprise Architecture.