The phrase "are primarily available" is correct and usable in written English.
It can be used to indicate that something is mostly accessible or obtainable in a particular context or situation.
Example: "The resources for this project are primarily available online, making it easy for team members to access them from anywhere."
Alternatives: "are mainly accessible" or "are chiefly obtainable."
Finished CD's, made by Epic, are available within a week or so and are primarily available to order online.
Funds from the HUH are primarily available to support projects in the field of plant biology.
Videos are primarily available for the purpose of review, or if you have to miss a lecture or two.
They are primarily available at the wineries (though Boxwood sells its wines through its Tasting Room outlets in Middleburg, Reston and Chevy Chase).
Today, the texts are generally unavailable in published form and are primarily available in the Agit-Prop-Sammlung at the Akademie der Künste Archiv in Berlin.
Research Assistantships are primarily available in the Research Laboratory of Electronics, the Plasma Science and Fusion Center, and, by arrangement, at Lincoln Laboratory, located in Lexington, MA.
Few North Koreans have access to the internet, but for those elites who do, access is primarily available through Chinese networks and service providers.
At the Home Heat Helpline launch, it was announced that more than £300m has been provided by energy companies this year to fund the Warm Homes Discount, which is primarily available to pensioners receiving pensions credit.
Constructing a cost-effective and detailed digital soil map of Africa will require the extensive utilization of both legacy soil data and legacy soil-landscape knowledge — which in Africa is primarily available from reconnaissance-scale catena or association maps and related studies.
The product is primarily available online and recently at Nordstrom and Reformation.
Government bailout programs have been primarily available to financial institutions and issuers, not to securities lending pools.
