The phrase "available nowhere" is correct and usable in written English.
It can be used to indicate that something cannot be found or accessed in any location.
Example: "The rare book was available nowhere, leaving collectors disappointed in their search."
Alternatives: "not found anywhere" or "accessible nowhere".
They provided him and the site with reliable reporting available nowhere else.
At Columbia Engineering in New York City, you'll gain important academic advantages available nowhere else.
It is available nowhere else, and nothing else I've ever tasted is quite like it.
Visual media from leading museums, photo archives, scholars, and artists, offering many rare and important collections available nowhere else.
Because of its early origin, the Day Library contains many works that are available nowhere else in the United States.
I asked the waiter, but the most he would reveal was that it was an old Cantonese recipe, which, he said, was available nowhere else.
But the Stanford MSx Program still offers high-performing managers a chance to reassess and broaden their focus at mid-career without the distractions of work — a chance that is available almost nowhere else.
They each independently discovered Mr. Fadeley's Deli-Pub, which still exists on Montauk Highway in Patchogue, serving the sort of dark German beers that were available almost nowhere else.
And, indeed, it was impossible to miss one key phenomenon: nearly every black actress in Hollywood, from King and Davis to Taraji P. Henson, Kerry Washington, Tracee Ellis Ross, and Niecy Nash, along with all of the "Orange Is the New Black" cast members who weren't even recognized this season, were finding roles available almost nowhere in the movies.
Unfortunately, given how busy the ward was, there was nowhere available other than the bedside.
We tried to fly her to a more suitable position for her condition, but there was nowhere available – so she died.
