However, it appears that the RPL-375 has now been officially released and is available on the Optotronics website! Until now, people were only able to buy the RPL-375 by contacting Optotronics privately.
By the way, here is Google's most recent snapshot of the Optotronics website.
edit: typo fixed
By the way, here is Google's most recent snapshot of the Optotronics website.
edit: typo fixed