Hello Audrey,
You are correct that you can get an ILP number from the AKC. This site can give you more information:
http://www.akc.org/registration/ilpex.cfm
You do have to take pictures and pay a registration fee, which I think is around $30. The ILP will allow you to show in performance events only, no confirmation, and I believe the dog has to be spayed/neutered in order to get the ILP.
Hopefully that helps you out! : )
Donna
River Falls, WI