According to the curator at the HP Computer Museum in Australia the 2115 model was not a very popular computer and, as a result, it is very rare.
We suspect that there are more HP 2115A machines out there but have not been able to locate any computers other than the one in our collection.
For more information, click on the link(s) below.
HP Computer Museum in Melbourne, Australia
If you know the location of any other of these, please let us know by contacting us at info@EarlyComputers.com.