It was pointed out in another thread that there is a dedicated web site for Blu-ray changers:http://blu-raychanger.com/
The site lists changers from Sony and three other vendors, Crestron, Kaleidescape, and S1Digital. I did more research on the web and found:
* the Crestron model has been discontinued (http://www.crestron.com/resources/product_and_programming_resources/catalogs_and_brochures/online_catalog/default.asp?jump=1&model=adc-200br
* the S1Digital seems to have never been released
* the Kaleidescape DV700 is still available from the vendor, for $5495, "Insert your Blu‑ray Discs, DVDs and CDs and the DV700 Disc Vault automatically copies them onto your Kaleidescape System. Up to 320 discs can be loaded into the vault making it easy to add great content to your library." http://www.kaleidescape.com/products/premiere/disc-vaults/dv700/
Note that "article dates" on the blu-raychanger.com website are much later than the release dates of the products. For example, an article on Sony BDP-CX960 was added in Mar 2013, but information on Amazon shows this model was released in Sep 2009.