The phrase "are neither available" is correct and usable in written English.
It can be used when indicating that two or more items or options are not accessible or present.
Example: "The requested documents are neither available in the office nor online."
Alternatives: "are not accessible" or "are unavailable."
Authors of a cost-benefit analysis by the National Center of Early Assistance (NZFH, Nationales Zentrum Frühe Hilfen) [ 51] express concern that national studies on trauma follow-up costs are neither available nor feasible in Germany due to the non-availability of data.
In many developing countries and remote areas of important ecosystems, good quality precipitation data are neither available nor readily accessible.
"Labour is developing a programme suited to these post-Crash times when spending or borrowing solutions are neither available nor adequate to deal with the challenges ahead".
The use of remotely sensed data to describe, study, monitor and provide greater understanding on watershed's landscape dynamics have proven to be useful worldwide, especially where timely and reliable ground information are neither available nor accessible like in most of the developing world.
Such transition patterns are neither available in multiple histograms of individual voting phase nor generated in real time to be visualized as a flow diagram.
We focus on the structure of service and parameter relation instead of looking at other external sources of information about the service (e.g., authorship) since they often are neither available nor reliable.
Their conversation while they waited was devoted to the difficulties that had arisen because a typeface was neither available nor obtainable.
It required a technologically novel and robust distribution system for which there was neither available on hand engineering expertise, practical knowledge nor sufficient economic means.
This may expand the applicability of the atlas to become an aid for neurological diagnosis and pathology localization, particularly, in the radiology deprived regions, where diagnostic imaging is neither available nor affordable.
The first alternative, a plant that generates only mutant pollen because it is homozygous for the mutation, may be neither available nor desirable, because it would then be impossible to distinguish sporophytic from gametophytic functions of the gene.
