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The phrase "either unavailable" is correct and usable in written English.
You can use it when you need to express the lack of availability of two or more things. For example, "The tickets for both events were either unavailable or very expensive."
Exact(60)
Talented folks here are either unavailable now or you're bidding for their services.
For most Americans, trains are either unavailable or too inconvenient and expensive compared with planes or buses.
When asked if they were members of the lobby group, Amazon and Apple were either unavailable or declined to comment.
Presumably she's only taking part in Eurovision because Viscount Percival Frippington-Tinkletrump is either unavailable or fictional.
Due to the war and uncontrolled inflation, healthcare is either unavailable or inaccessible to large parts of the population.
Spokesmen for the other publishers and for Barnes & Noble were either unavailable or declined to comment yesterday.
Prosecutors said they abandoned the case because crucial witnesses were either unavailable or unreliable, not because they were convinced of the two men's innocence.
At two of the schools, the data was either unavailable or the sample size was too small to convert it into a statistically significant percentage.
Very few of the looted stores were insured; most were in dangerous neighborhoods where insurance was either unavailable or prohibitively expensive.
But as I tried to book those rooms, they were either unavailable, more expensive than the initial list price, or in hotels without power.
Solar cell panels also are used to provide electric power in many remote terrestrial locations where conventional electric power sources are either unavailable or prohibitively expensive to install.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com