The phrase "unavailable either" is correct and can be used in written English.
It is typically used to convey the idea that something is not available or cannot be done in any way. Example: "I'm sorry, but the meeting room is unavailable either for the next two weeks." This means that the meeting room cannot be booked or used for any of the next two weeks.
"This is a standard electronic payment process which means that funds are held on the payment card by the customer's bank as unavailable either until the merchant clears the transaction or the hold is removed," it says.
I know some of the big names have been unavailable, either through injury or as a result of misbehaviour, but even so the lack of continuity has been astonishing.
Continuity of selection is apparent, coming off the back of the last minute victory against Italy in the summer, along with the addition of a couple of players who were unavailable either through Lions selection or injury.
The alimentary tract was reconstructed using the gastric pull-up technique; if the stomach was unavailable, either a jejunal loop or the left colon was used [ 24].
The rest was considered unavailable either because their current postal address was unknown or due to fear that they might react negatively to be addressed as "MS patients" for the purpose of a survey.
Trend data were generally unavailable either due to an absence of maintenance of a historic database, or because previous estimates of variables were made in a way not comparable with those of present estimates.
The Warriors had 10 players unavailable through either injury or being dumped to reserve grade for breaking team protocol.
They aim to make a server resource unavailable by either damaging data or software or flooding the network with a huge amount of traffic.
Author response: Unfortunately, large collections of mutations are unavailable for either p63 or p73.
When data were unavailable by either of these approaches, we used other surveillance data, such as outbreak data.
Detailed pedigrees were unavailable, because either relatives of many of the patients were dead or the relatives themselves had limited knowledge of their families ancestry.
