Just an update. I have been unable to get any response from Acard or its US counterpart, 4SAN, even though the latter has items up on eBay.
There are some providers which show the 7730A available in-stock with astronomical prices; obviously they are aware of the situation and the sudden scarcity of the part.
As well, while researching I found a number of personnel reviews of the company which indicate to me Acard was starting to disintegrate during Q4 2017. The Acard website had a notice of having been offline due to floods coming back on-line in December.