Try ebay.....that will allow you to find dealers and collectors of such stuff.....and they might help you.
Linda C

Here is a link that might be useful: Old photos

Unless the photographer was a true "name" artist--like Ansel Adams, there's no added value to these being done by a professional. Old photos are usually worth whatever someone wants to pay, unless there subject is of unusual historic interest. Donating them to a local musuem or historical archive would get you a tax deduction that will probably be greate than anything you can get from a sale.
For Los Angeles, take a look at the Public Library's special collection--you can search online.

There are some of historical interest, such as the ones of the orphanage and the prints of what the new one would look like. Some just show streets and cars. I'll check the Library's collection online. I'm not sure that I can give them up, but I might be willing to lend them out which is something I hadn't considered before.

I'm off to check out the ebay link now.
Thank you,
Carlota